chore(deps): bump requests from 2.27.1 to 2.31.0 in /.kokoro (#2315)

* chore(deps): bump requests from 2.27.1 to 2.31.0 in /.kokoro

Bumps [requests](https://github.com/psf/requests) from 2.27.1 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.27.1...v2.31.0)

---
updated-dependencies:
- dependency-name: requests
  dependency-type: indirect
...

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