Update dependency google-api-python-client to v1.9.3 [(#4057)](GoogleCloudPlatform/python-docs-samples#4057)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-api-python-client](https://togithub.com/googleapis/google-api-python-client) | patch | `==1.9.2` -> `==1.9.3` |

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### Release Notes

<details>
<summary>googleapis/google-api-python-client</summary>

### [`v1.9.3`](https://togithub.com/googleapis/google-api-python-client/blob/master/CHANGELOG.md#&#8203;193-httpswwwgithubcomgoogleapisgoogle-api-python-clientcomparev192v193-2020-06-10)

[Compare Source](https://togithub.com/googleapis/google-api-python-client/compare/v1.9.2...v1.9.3)

</details>

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samples/snippets/api/requirements.txt

@@ -1,3 +1,3 @@
-google-api-python-client==1.9.2
+google-api-python-client==1.9.3
 google-auth==1.17.2
 google-auth-httplib2==0.0.3