build(deps): bump google-cloud-storage from 2.11.0 to 2.12.0 in /bot (#2120)

Bumps [google-cloud-storage](https://github.com/googleapis/python-storage) from 2.11.0 to 2.12.0.
- [Release notes](https://github.com/googleapis/python-storage/releases)
- [Changelog](https://github.com/googleapis/python-storage/blob/main/CHANGELOG.md)
- [Commits](googleapis/python-storage@v2.11.0...v2.12.0)

---
updated-dependencies:
- dependency-name: google-cloud-storage
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

bot/requirements.txt

@@ -1,5 +1,5 @@
 -e ../tools #egg=code-coverage-tools
-google-cloud-storage==2.11.0
+google-cloud-storage==2.12.0
 libmozdata==0.2.4
 pytoml==0.1.21
 pyyaml==6.0.1