chore(deps): update dependency google-api-python-client to v1.8.0 [(#…

…3100)](GoogleCloudPlatform/python-docs-samples#3100)

This PR contains the following updates:

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

---

### Release Notes

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

### [`v1.8.0`](https://togithub.com/google/google-api-python-client/releases/v1.8.0)

[Compare Source](https://togithub.com/google/google-api-python-client/compare/v1.7.12...v1.8.0)

Release to support API endpoint override.

  New Features

-   Add api endpoint override. ([#&#8203;829](https://togithub.com/googleapis/google-api-python-client/pull/829))

    Implementation Changes

-   Don't set http.redirect_codes if the attr doesn't exist and allow more httplib2 versions. ([#&#8203;841](https://togithub.com/googleapis/google-api-python-client/pull/841))

### [`v1.7.12`](https://togithub.com/google/google-api-python-client/releases/v1.7.12)

[Compare Source](https://togithub.com/google/google-api-python-client/compare/v1.7.11...v1.7.12)

Bugfix release

  Implementation Changes

-   Look for field 'detail' in error message. ([#&#8203;739](https://togithub.com/googleapis/google-api-python-client/pull/739))
-   Exclude 308s from httplib2 redirect codes list ([#&#8203;813](https://togithub.com/googleapis/google-api-python-client/pull/813))

    Documentation 

-   Remove oauth2client from docs ([#&#8203;738](https://togithub.com/googleapis/google-api-python-client/pull/738))
-   Fix typo. ([#&#8203;745](https://togithub.com/googleapis/google-api-python-client/pull/745))
-   Remove compatibility badges. ([#&#8203;746](https://togithub.com/googleapis/google-api-python-client/pull/746))
-   Fix TypeError: search_analytics_api_sample.py [#&#8203;732](https://togithub.com/google/google-api-python-client/issues/732) ([#&#8203;742](https://togithub.com/googleapis/google-api-python-client/pull/742))
-   Correct response access ([#&#8203;750](https://togithub.com/googleapis/google-api-python-client/pull/750))
-   Fix link to API explorer ([#&#8203;760](https://togithub.com/googleapis/google-api-python-client/pull/760))
-   Fix argument typo in oauth2 code example ([#&#8203;763](https://togithub.com/googleapis/google-api-python-client/pull/763))
-   Recommend install with virtualenv ([#&#8203;768](https://togithub.com/googleapis/google-api-python-client/pull/768))
-   Fix capitalization in docs/README.md ([#&#8203;770](https://togithub.com/googleapis/google-api-python-client/pull/770))

-   Remove compatibility badges ([#&#8203;796](https://togithub.com/googleapis/google-api-python-client/pull/796))
-   Remove mentions of pycrypto ([#&#8203;799](https://togithub.com/googleapis/google-api-python-client/pull/799))
-   Fix typo in model.py
-   Add note about Google Ads llibrary ([#&#8203;814](https://togithub.com/googleapis/google-api-python-client/pull/814))

  Internal / Testing Changes

-   Blacken ([#&#8203;772](https://togithub.com/googleapis/google-api-python-client/pull/722))
-   Move kokoro configs ([#&#8203;832](https://togithub.com/googleapis/google-api-python-client/pull/832))

</details>

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samples/api-client/manager/requirements.txt

@@ -1,6 +1,6 @@
 cryptography==2.8
 flaky==3.6.1
-google-api-python-client==1.7.11
+google-api-python-client==1.8.0
 google-auth-httplib2==0.0.3
 google-auth==1.14.0
 google-cloud-iot==1.0.0