chore(deps): update dependency google-cloud-monitoring to v2.4.1 (#187)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-monitoring](https://togithub.com/googleapis/python-monitoring) | `==2.4.0` -> `==2.4.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-monitoring/2.4.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-monitoring/2.4.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-monitoring/2.4.1/compatibility-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-monitoring/2.4.1/confidence-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.4.1`](https://togithub.com/googleapis/python-monitoring/blob/master/CHANGELOG.md#&#8203;241-httpswwwgithubcomgoogleapispython-monitoringcomparev240v241-2021-07-20)

[Compare Source](https://togithub.com/googleapis/python-monitoring/compare/v2.4.0...v2.4.1)

</details>

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monitoring/snippets/v3/alerts-client/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-monitoring==2.4.0
+google-cloud-monitoring==2.4.1
 tabulate==0.8.9

monitoring/snippets/v3/cloud-client/requirements.txt

@@ -1 +1 @@
-google-cloud-monitoring==2.4.0
+google-cloud-monitoring==2.4.1

monitoring/snippets/v3/uptime-check-client/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-monitoring==2.4.0
+google-cloud-monitoring==2.4.1
 tabulate==0.8.9