Bump google-api-core from 2.14.0 to 2.15.0

Bumps [google-api-core](https://github.com/googleapis/python-api-core) from 2.14.0 to 2.15.0.
- [Release notes](https://github.com/googleapis/python-api-core/releases)
- [Changelog](https://github.com/googleapis/python-api-core/blob/main/CHANGELOG.md)
- [Commits](googleapis/python-api-core@v2.14.0...v2.15.0)

---
updated-dependencies:
- dependency-name: google-api-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -10,7 +10,7 @@ charset-normalizer==2.0.12
 chess==1.10.0
 cssselect2==0.7.0
 frozenlist==1.4.0
-google-api-core==2.14.0
+google-api-core==2.15.0
 google-api-python-client==2.109.0 
 google-auth==2.25.1
 google-auth-httplib2==0.1.1