chore(deps): update dependency google-cloud-monitoring to v2.5.0 (GoogleCloudPlatform#6638)

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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) | `==2.4.2` -> `==2.5.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-monitoring/2.5.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-monitoring/2.5.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-monitoring/2.5.0/compatibility-slim/2.4.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-monitoring/2.5.0/confidence-slim/2.4.2)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v2.5.0`](https://togithub.com/googleapis/python-monitoring/blob/master/CHANGELOG.md#&#8203;250-httpswwwgithubcomgoogleapispython-monitoringcomparev242v250-2021-08-27)

[Compare Source](https://togithub.com/googleapis/python-monitoring/compare/v2.4.2...v2.5.0)

##### Features

-   Added support for log-based alerts ([#&GoogleCloudPlatform#8203;204](https://www.togithub.com/googleapis/python-monitoring/issues/204)) ([b56a78c](https://www.github.com/googleapis/python-monitoring/commit/b56a78c50780e778f8ce1ad956e621433d1c451b))
-   Added support for user-defined labels on cloud monitoring's Service object ([b56a78c](https://www.github.com/googleapis/python-monitoring/commit/b56a78c50780e778f8ce1ad956e621433d1c451b))
-   Added support for user-defined labels on cloud monitoring's ServiceLevelObjective object ([b56a78c](https://www.github.com/googleapis/python-monitoring/commit/b56a78c50780e778f8ce1ad956e621433d1c451b))

##### Bug Fixes

-   mark required fields in QueryTimeSeriesRequest as required by the backend ([b56a78c](https://www.github.com/googleapis/python-monitoring/commit/b56a78c50780e778f8ce1ad956e621433d1c451b))

##### Documentation

-   **samples:** include example writing of label data ([#&GoogleCloudPlatform#8203;202](https://www.togithub.com/googleapis/python-monitoring/issues/202)) ([f5e8cf8](https://www.github.com/googleapis/python-monitoring/commit/f5e8cf8b51812b9e79bb5312f84e29b3f8c2c81e))

##### [2.4.2](https://www.github.com/googleapis/python-monitoring/compare/v2.4.1...v2.4.2) (2021-07-28)

##### Bug Fixes

-   enable self signed jwt for grpc ([#&GoogleCloudPlatform#8203;190](https://www.togithub.com/googleapis/python-monitoring/issues/190)) ([502487a](https://www.github.com/googleapis/python-monitoring/commit/502487a6c40322b5d8a9d38e9bd0783c0db9d756))

##### Documentation

-   add Samples section to CONTRIBUTING.rst ([#&GoogleCloudPlatform#8203;184](https://www.togithub.com/googleapis/python-monitoring/issues/184)) ([5b7b07b](https://www.github.com/googleapis/python-monitoring/commit/5b7b07b263e2e86f0b504b721c4295f7d8bb542a))

##### Miscellaneous Chores

-   release as 2.4.2 ([#&GoogleCloudPlatform#8203;191](https://www.togithub.com/googleapis/python-monitoring/issues/191)) ([6f183dd](https://www.github.com/googleapis/python-monitoring/commit/6f183ddeef540be4f47ee553e2b2ee8424508968))

##### [2.4.1](https://www.github.com/googleapis/python-monitoring/compare/v2.4.0...v2.4.1) (2021-07-20)

##### Bug Fixes

-   **deps:** pin 'google-{api,cloud}-core', 'google-auth' to allow 2.x versions ([#&GoogleCloudPlatform#8203;183](https://www.togithub.com/googleapis/python-monitoring/issues/183)) ([fdc5b07](https://www.github.com/googleapis/python-monitoring/commit/fdc5b0729cb3cb7e204c36569f253fb57728b740))

</details>

---

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trace/cloud-trace-demo-app-opentelemetry/app/requirements.txt

@@ -5,5 +5,5 @@ opentelemetry-propagator-gcp==1.0.0
 opentelemetry-instrumentation-flask==0.20b0
 grpcio==1.39.0
 httpretty==1.1.4
-google-cloud-monitoring==2.4.2
+google-cloud-monitoring==2.5.0
 google-cloud-trace==0.24.0

trace/cloud-trace-demo-app/app/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-monitoring==2.4.2
+google-cloud-monitoring==2.5.0
 google-cloud-trace==0.24.0
 opencensus==0.7.13
 # Don't upgrade to 2.0.0 yet until opencensus-ext-flask is okay with it