chore(deps): update dependency google-cloud-pubsub to v2.4.1 (GoogleCloudPlatform#5610)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-pubsub](https://togithub.com/googleapis/python-pubsub) | `==2.4.0` -> `==2.4.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-pubsub/2.4.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-pubsub/2.4.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-pubsub/2.4.1/compatibility-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-pubsub/2.4.1/confidence-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/python-pubsub</summary>

### [`v2.4.1`](https://togithub.com/googleapis/python-pubsub/blob/master/CHANGELOG.md#&#8203;241-httpswwwgithubcomgoogleapispython-pubsubcomparev240v241-2021-03-30)

[Compare Source](https://togithub.com/googleapis/python-pubsub/compare/v2.4.0...2.4.1)

##### Bug Fixes

-   Move `await_msg_callbacks` flag to `subscribe()` method, fixing a regression in Pub/Sub Lite client.
    ([#&GoogleCloudPlatform#8203;320](https://www.github.com/googleapis/python-pubsub/issues/320)) ([d40d027](https://www.github.com/googleapis/python-pubsub/commit/d40d02713c8c189937ae5c21d099b88a3131a59f))
-   SSL error when using the client with the emulator. ([#&GoogleCloudPlatform#8203;297](https://www.github.com/googleapis/python-pubsub/issues/297)) ([83db672](https://www.github.com/googleapis/python-pubsub/commit/83db67239d3521457138699109f766d574a0a2c4))

##### Implementation Changes

-   (samples) Bump the max_time to 10 minutes for a flaky test. ([#&GoogleCloudPlatform#8203;311](https://www.github.com/googleapis/python-pubsub/issues/311)) ([e2678d4](https://www.github.com/googleapis/python-pubsub/commit/e2678d47c08e6b03782d2d744a4e630b933fdd51)), closes [#&GoogleCloudPlatform#8203;291](https://www.github.com/googleapis/python-pubsub/issues/291)
-   (samples) Mark delivery attempts test as flaky. ([#&GoogleCloudPlatform#8203;326](https://www.github.com/googleapis/python-pubsub/issues/326)) ([5a97ef1](https://www.github.com/googleapis/python-pubsub/commit/5a97ef1bb7512fe814a8f72a43b3e9698434cd8d))
-   (samples) Mitigate flakiness in subscriber_tests. ([#&GoogleCloudPlatform#8203;304](https://www.github.com/googleapis/python-pubsub/issues/304)) ([271a385](https://www.github.com/googleapis/python-pubsub/commit/271a3856d835967f18f6becdae5ad53d585d0ccf))
-   (samples) Retry `InternalServerError` in dead letter policy test. ([#&GoogleCloudPlatform#8203;329](https://www.github.com/googleapis/python-pubsub/issues/329)) ([34c9b11](https://www.github.com/googleapis/python-pubsub/commit/34c9b11ae697c280f32642c3101b7f7da971f589)), closes [#&GoogleCloudPlatform#8203;321](https://www.github.com/googleapis/python-pubsub/issues/321)

##### Documentation

-   Remove EXPERIMENTAL tag for ordering keys in `types.py`. ([#&GoogleCloudPlatform#8203;323](https://www.github.com/googleapis/python-pubsub/issues/323)) ([659cd7a](https://www.github.com/googleapis/python-pubsub/commit/659cd7ae2784245d4217fbc722dac04bd3222d32))
-   Remove EXPERIMENTAL tag from `Schema` service (via synth). ([#&GoogleCloudPlatform#8203;307](https://www.github.com/googleapis/python-pubsub/issues/307)) ([ad85202](https://www.github.com/googleapis/python-pubsub/commit/ad852028836520db779c5cc33689ffd7e5458a7d))

</details>

---

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appengine/flexible/pubsub/requirements.txt

@@ -1,3 +1,3 @@
 Flask==1.1.2
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 gunicorn==20.1.0

appengine/standard_python3/pubsub/requirements.txt

@@ -1,4 +1,4 @@
 Flask==1.1.2
 google-api-python-client==2.1.0
 google-auth==1.28.0
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1

functions/ocr/app/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 google-cloud-storage==1.37.0
 google-cloud-translate==3.1.0
 google-cloud-vision==2.3.0

functions/pubsub/requirements.txt

@@ -1 +1 @@
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1

functions/tips/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-error-reporting==1.1.1
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 python-dateutil==2.8.1
 requests==2.25.1
 xmltodict==0.12.0

healthcare/api-client/v1/dicom/requirements.txt

@@ -1,5 +1,5 @@
 google-api-python-client==2.1.0
 google-auth-httplib2==0.1.0
 google-auth==1.28.0
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 requests==2.25.1

iot/api-client/end_to_end_example/requirements.txt

@@ -2,6 +2,6 @@ cryptography==3.4.7
 google-api-python-client==2.1.0
 google-auth-httplib2==0.1.0
 google-auth==1.28.0
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 pyjwt==2.0.1
 paho-mqtt==1.5.1

iot/api-client/gcs_file_to_device/requirements.txt

@@ -2,7 +2,7 @@ google-api-python-client==2.1.0
 google-auth==1.28.0
 google-auth-httplib2==0.1.0
 google-cloud-iot==2.0.2
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 google-cloud-storage==1.37.0
 cryptography==3.4.7
 paho-mqtt==1.5.1

iot/api-client/http_example/requirements.txt

@@ -3,6 +3,6 @@ google-api-python-client==2.1.0
 google-auth-httplib2==0.1.0
 google-auth==1.28.0
 google-cloud-iot==2.0.2
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 pyjwt==2.0.1
 requests==2.25.1

iot/api-client/mqtt_example/requirements.txt

@@ -2,7 +2,7 @@ cryptography==3.4.7
 google-api-python-client==2.1.0
 google-auth-httplib2==0.1.0
 google-auth==1.28.0
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 google-cloud-iot==2.0.2
 grpc-google-iam-v1==0.12.3
 pyjwt==2.0.1

iot/api-client/scripts/requirements.txt

@@ -1 +1 @@
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1

run/image-processing/requirements-test.txt

@@ -1,3 +1,3 @@
 pytest==6.2.1
 mock==4.0.3
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1

run/pubsub/requirements-test.txt

@@ -1,3 +1,3 @@
 pytest==6.2.1
 google-cloud-logging==1.15.1
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1

storage/cloud-client/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-pubsub==2.4.0
+google-cloud-pubsub==2.4.1
 google-cloud-storage==1.37.0