chore(deps): update dependency google-cloud-datalabeling to v0.4.0 (GoogleCloudPlatform#3081)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-datalabeling](https://togithub.com/googleapis/python-datalabeling) | minor | `==0.3.0` -> `==0.4.0` |

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### Release Notes

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

### [`v0.4.0`](https://togithub.com/googleapis/python-datalabeling/blob/master/CHANGELOG.md#&#8203;040-httpswwwgithubcomgoogleapispython-datalabelingcomparev030v040-2020-01-31)

[Compare Source](https://togithub.com/googleapis/python-datalabeling/compare/v0.3.0...v0.4.0)

##### Features

-   **datalabeling:** undeprecate resource name helper methods (via synth) ([#&GoogleCloudPlatform#8203;10039](https://www.github.com/googleapis/python-datalabeling/issues/10039)) ([88f8090](https://www.github.com/googleapis/python-datalabeling/commit/88f809008ee6a709c02c78b1d93af779fab19adb))

##### Bug Fixes

-   **datalabeling:** deprecate resource name helper methods (via synth) ([#&GoogleCloudPlatform#8203;9832](https://www.github.com/googleapis/python-datalabeling/issues/9832)) ([e5f9021](https://www.github.com/googleapis/python-datalabeling/commit/e5f902154ebe7fcb139aa405babfe9993fd51319))

</details>

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datalabeling/requirements.txt

@@ -1 +1 @@
-google-cloud-datalabeling==0.3.0
+google-cloud-datalabeling==0.4.0