fix(deps): update dependency google/cloud-compute to ^0.2.0 (GoogleCloudPlatform#1352)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [google/cloud-compute](https://togithub.com/googleapis/google-cloud-php-compute) | require | minor | `^0.1.0` -> `^0.2.0` |

---

### Release Notes

<details>
<summary>googleapis/google-cloud-php-compute</summary>

### [`v0.2.1`](https://togithub.com/googleapis/google-cloud-php-compute/releases/v0.2.1)

[Compare Source](https://togithub.com/googleapis/google-cloud-php-compute/compare/v0.2.0...v0.2.1)

##### google/cloud-compute 0.2.1

##### Miscellaneous Chores

-   add readme ([#&#8203;4032](https://www.github.com/googleapis/google-cloud-php/issues/4032)) ([9ed4d2f](https://www.github.com/googleapis/google-cloud-php/commit/9ed4d2faf171350bef698d7f0bd205d1073fb7b5))
-   update list sample ([#&#8203;4031](https://www.github.com/googleapis/google-cloud-php/issues/4031)) ([c24e8f6](https://www.github.com/googleapis/google-cloud-php/commit/c24e8f61d4fb39d20dafb8e85f80849e9d3ef0e6))

### [`v0.2.0`](https://togithub.com/googleapis/google-cloud-php-compute/releases/v0.2.0)

[Compare Source](https://togithub.com/googleapis/google-cloud-php-compute/compare/v0.1.1...v0.2.0)

##### google/cloud-compute 0.2.0

##### Features

-   Regenerate GCE DIREGAPIC client with the microgenerator [google-cloud-php]([#&#8203;4023](https://www.github.com/googleapis/google-cloud-php/issues/4023)) ([fe5e6bd](https://www.github.com/googleapis/google-cloud-php/commit/fe5e6bdb857e420356b25e9c75e7e212b7865ee2))

</details>

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compute/cloud-client/helloworld/composer.json

@@ -1,5 +1,5 @@
 {
     "require": {
-        "google/cloud-compute": "^0.1.0"
+        "google/cloud-compute": "^0.2.0"
     }
 }