chore(deps): update dependency google-cloud-scheduler to v2.3.1 (#113)

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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) | `==2.3.0` -> `==2.3.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-scheduler/2.3.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-scheduler/2.3.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-scheduler/2.3.1/compatibility-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-scheduler/2.3.1/confidence-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.3.1`](https://togithub.com/googleapis/python-scheduler/blob/master/CHANGELOG.md#&#8203;231-httpswwwgithubcomgoogleapispython-schedulercomparev230v231-2021-07-20)

[Compare Source](https://togithub.com/googleapis/python-scheduler/compare/v2.3.0...v2.3.1)

</details>

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scheduler/snippets/requirements.txt

@@ -1,3 +1,3 @@
 Flask==2.0.1
 gunicorn==20.1.0
-google-cloud-scheduler==2.3.0
+google-cloud-scheduler==2.3.1