chore(deps): bump google-cloud-aiplatform from 1.50.0 to 1.53.0

Bumps [google-cloud-aiplatform](https://github.com/googleapis/python-aiplatform) from 1.50.0 to 1.53.0.
- [Release notes](https://github.com/googleapis/python-aiplatform/releases)
- [Changelog](https://github.com/googleapis/python-aiplatform/blob/main/CHANGELOG.md)
- [Commits](googleapis/python-aiplatform@v1.50.0...v1.53.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

webhook/requirements.txt

@@ -14,7 +14,7 @@
 
 flask==3.0.3
 functions-framework==3.7.0
-google-cloud-aiplatform==1.50.0
+google-cloud-aiplatform==1.53.0
 google-cloud-documentai==2.27.0
 google-cloud-firestore==2.16.0
 google-cloud-storage==2.16.0