chore(deps): update dependency google-api-core to v2.1.1 (#1027)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-api-core](https://togithub.com/googleapis/python-api-core) | `==2.1.0` -> `==2.1.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-api-core/2.1.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-api-core/2.1.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-api-core/2.1.1/compatibility-slim/2.1.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-api-core/2.1.1/confidence-slim/2.1.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-api-core</summary>

### [`v2.1.1`](https://togithub.com/googleapis/python-api-core/blob/master/CHANGELOG.md#&#8203;211-httpswwwgithubcomgoogleapispython-api-corecomparev210v211-2021-10-13)

[Compare Source](https://togithub.com/googleapis/python-api-core/compare/v2.1.0...v2.1.1)

</details>

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requirements.txt

@@ -1,5 +1,5 @@
 click==8.0.3
-google-api-core==2.1.0
+google-api-core==2.1.1
 googleapis-common-protos==1.53.0
 jinja2==3.0.2
 MarkupSafe==2.0.1