chore(deps): update dependency google-cloud-scheduler to v2.3.0 (#107)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-scheduler](https://togithub.com/googleapis/python-scheduler) | `==2.2.0` -> `==2.3.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-scheduler/2.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-scheduler/2.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-scheduler/2.3.0/compatibility-slim/2.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-scheduler/2.3.0/confidence-slim/2.2.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-scheduler</summary>

### [`v2.3.0`](https://togithub.com/googleapis/python-scheduler/blob/master/CHANGELOG.md#&#8203;230-httpswwwgithubcomgoogleapispython-schedulercomparev220v230-2021-07-01)

[Compare Source](https://togithub.com/googleapis/python-scheduler/compare/v2.2.0...v2.3.0)

##### Features

-   add always_use_jwt_access ([#&#8203;102](https://www.github.com/googleapis/python-scheduler/issues/102)) ([bd5550b](https://www.github.com/googleapis/python-scheduler/commit/bd5550b4c7732ad20c5a16fa0ac2c9f86704b8fc))

##### Bug Fixes

-   **deps:** add packaging requirement ([#&#8203;89](https://www.github.com/googleapis/python-scheduler/issues/89)) ([8966559](https://www.github.com/googleapis/python-scheduler/commit/8966559b7bf2e4409906ca4a5eb831a011ba3484))
-   disable always_use_jwt_access ([#&#8203;106](https://www.github.com/googleapis/python-scheduler/issues/106)) ([c8dd497](https://www.github.com/googleapis/python-scheduler/commit/c8dd497c56f475c63c05c2ba5708067cc03c4173))

##### Documentation

-   omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#&#8203;1127](https://www.github.com/googleapis/python-scheduler/issues/1127)) ([#&#8203;99](https://www.github.com/googleapis/python-scheduler/issues/99)) ([2dcbcdf](https://www.github.com/googleapis/python-scheduler/commit/2dcbcdf36c7678ee62d2b76ea31bee69f597d3b2)), closes [#&#8203;1126](https://www.github.com/googleapis/python-scheduler/issues/1126)

</details>

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scheduler/snippets/requirements.txt

@@ -1,3 +1,3 @@
 Flask==2.0.1
 gunicorn==20.1.0
-google-cloud-scheduler==2.2.0
+google-cloud-scheduler==2.3.0