chore(deps): update dependency googleapis-common-protos to v1.51.0 [(…

…#3171)](GoogleCloudPlatform/python-docs-samples#3171)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [googleapis-common-protos](https://togithub.com/googleapis/googleapis) | minor | `==1.6.0` -> `==1.51.0` |

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samples/snippets/requirements.txt

@@ -1,2 +1,2 @@
 google-cloud-tasks==1.5.0
-googleapis-common-protos==1.6.0
+googleapis-common-protos==1.51.0