Update dependency google-api-python-client to v1.8.2 [(#3452)](GoogleCloudPlatform/python-docs-samples#3452)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-api-python-client](https://togithub.com/google/google-api-python-client) | patch | `==1.8.0` -> `==1.8.2` |
| [google-api-python-client](https://togithub.com/google/google-api-python-client) | minor | `==1.7.11` -> `==1.8.2` |

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### Release Notes

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

### [`v1.8.2`](https://togithub.com/google/google-api-python-client/blob/master/CHANGELOG.md#&#8203;182-httpswwwgithubcomgoogleapisgoogle-api-python-clientcomparev181v182-2020-04-21)

[Compare Source](https://togithub.com/google/google-api-python-client/compare/v1.8.1...v1.8.2)

### [`v1.8.1`](https://togithub.com/google/google-api-python-client/blob/master/CHANGELOG.md#&#8203;181-httpswwwgithubcomgoogleapisgoogle-api-python-clientcomparev180v181-2020-04-20)

[Compare Source](https://togithub.com/google/google-api-python-client/compare/v1.8.0...v1.8.1)

</details>

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samples/snippets/api/requirements.txt

@@ -1,3 +1,3 @@
-google-api-python-client==1.8.0
+google-api-python-client==1.8.2
 google-auth==1.14.0
 google-auth-httplib2==0.0.3