chore(deps): update dependency google-python-cloud-debugger to v3 (#8247)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-python-cloud-debugger](https://togithub.com/GoogleCloudPlatform/cloud-debug-python) | `==2.19` -> `==3.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-python-cloud-debugger/3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-python-cloud-debugger/3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-python-cloud-debugger/3.0/compatibility-slim/2.19)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-python-cloud-debugger/3.0/confidence-slim/2.19)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>GoogleCloudPlatform/cloud-debug-python</summary>

### [`v3.0`](https://togithub.com/GoogleCloudPlatform/cloud-debug-python/releases/tag/v3.0)

[Compare Source](https://togithub.com/GoogleCloudPlatform/cloud-debug-python/compare/v2.19...v3.0)

#### What's Changed

-   feat: add Firebase RTDB backend by [@&#8203;mctavish](https://togithub.com/mctavish) in [https://github.com/GoogleCloudPlatform/cloud-debug-python/pull/48](https://togithub.com/GoogleCloudPlatform/cloud-debug-python/pull/48)
-   feat: improve firebase error handling by [@&#8203;mctavish](https://togithub.com/mctavish) in [https://github.com/GoogleCloudPlatform/cloud-debug-python/pull/53](https://togithub.com/GoogleCloudPlatform/cloud-debug-python/pull/53)
-   chore: release 3.0 by [@&#8203;mctavish](https://togithub.com/mctavish) in [https://github.com/GoogleCloudPlatform/cloud-debug-python/pull/54](https://togithub.com/GoogleCloudPlatform/cloud-debug-python/pull/54)
-   build: bump to manylinux2014 by [@&#8203;mctavish](https://togithub.com/mctavish) in [https://github.com/GoogleCloudPlatform/cloud-debug-python/pull/55](https://togithub.com/GoogleCloudPlatform/cloud-debug-python/pull/55)

**Full Changelog**: GoogleCloudPlatform/cloud-debug-python@v2.19...v3.0

</details>

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appengine/standard_python3/cloud_debugger/requirements.txt

@@ -1,2 +1,2 @@
 Flask==2.1.0
-google-python-cloud-debugger==2.19
+google-python-cloud-debugger==3.0