chore(deps): update dependency google-api-python-client to v2.21.0 (#1525)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-api-python-client](https://togithub.com/googleapis/google-api-python-client) | `==2.20.0` -> `==2.21.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-api-python-client/2.21.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-api-python-client/2.21.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-api-python-client/2.21.0/compatibility-slim/2.20.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-api-python-client/2.21.0/confidence-slim/2.20.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v2.21.0`](https://togithub.com/googleapis/google-api-python-client/blob/master/CHANGELOG.md#&#8203;2210-httpswwwgithubcomgoogleapisgoogle-api-python-clientcomparev2200v2210-2021-09-14)

[Compare Source](https://togithub.com/googleapis/google-api-python-client/compare/v2.20.0...v2.21.0)

##### Features

-   **apigee:** update the api https://github.com/googleapis/google-api-python-client/commit/0e4fed7f1e08a616cbc81243c24391bc20ce5edb ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **bigquery:** update the api https://github.com/googleapis/google-api-python-client/commit/04e112ce89d6ddb3aeaae889c2de36070d6c2814 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **bigtableadmin:** update the api https://github.com/googleapis/google-api-python-client/commit/6b77931c3c9aba59d5b326c570a2080252c8beb1 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **cloudprofiler:** update the api https://github.com/googleapis/google-api-python-client/commit/3009ee3c238ae1fa51c529e9f187ec26693138a4 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **container:** update the api https://github.com/googleapis/google-api-python-client/commit/e5d01ecee51da0c7a2543b833a1395a94c27bef6 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **dataproc:** update the api https://github.com/googleapis/google-api-python-client/commit/fec73562a93b5a532bce6c91f0d30ec4fbd54ddb ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **displayvideo:** update the api https://github.com/googleapis/google-api-python-client/commit/22caa4f2f8ecb0f0ad6cfac547f9deb76fdcbebb ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **documentai:** update the api https://github.com/googleapis/google-api-python-client/commit/444836b9afe8d3eb8d52a1431652bfda1ad3288b ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **healthcare:** update the api https://github.com/googleapis/google-api-python-client/commit/2f3173aa4b4d154c909eea853a0c4c306834e0ab ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **ideahub:** update the api https://github.com/googleapis/google-api-python-client/commit/8ebf9d2bd419561d5eacb78823aa1fc519fe2710 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **memcache:** update the api https://github.com/googleapis/google-api-python-client/commit/393dce7a3e584ad6be58c832ec826fe3b44e353b ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **mybusinesslodging:** update the api https://github.com/googleapis/google-api-python-client/commit/c51a0d15e634c2ab1c7762533f33d59f10b01875 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **speech:** update the api https://github.com/googleapis/google-api-python-client/commit/bf6e86f6ee8c3985e1ce6f0475ef4f8685b52060 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **streetviewpublish:** update the api https://github.com/googleapis/google-api-python-client/commit/c8cf30cd67f5588d7cbe60631e42f0a49ea6c307 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))
-   **youtube:** update the api https://github.com/googleapis/google-api-python-client/commit/855cbfea1f6d46af07c4b80ab26fc30ca46370b7 ([e5e87b1](https://www.github.com/googleapis/google-api-python-client/commit/e5e87b1ca5fb6e81f6d83d970c3e4f683ecdcdea))

</details>

---

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diff --git a/samples/compute/requirements.txt b/samples/compute/requirements.txt
index 804fca2..a05c27a 100644
--- a/samples/compute/requirements.txt
+++ b/samples/compute/requirements.txt
@@ -1,3 +1,3 @@
-google-api-python-client==2.20.0
+google-api-python-client==2.21.0
 google-auth==2.1.0
 google-auth-httplib2==0.1.0