Bump google-api-core from 2.3.0 to 2.3.1 (#228)

Bumps [google-api-core](https://github.com/googleapis/python-api-core) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/googleapis/python-api-core/releases)
- [Changelog](https://github.com/googleapis/python-api-core/blob/v2.3.1/CHANGELOG.md)
- [Commits](googleapis/python-api-core@v2.3.0...v2.3.1)

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

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

requirements.txt

@@ -4,7 +4,7 @@ click==8.0.3
 pydantic==1.8.2
 
 #bigquery
-google-api-core==2.3.0
+google-api-core==2.3.1
 google-auth==2.3.3
 google-cloud-bigquery==2.31.0
 google-cloud-core==2.2.1