Bump requests from 2.25.1 to 2.28.1 (#899)

Bumps [requests](https://github.com/psf/requests) from 2.25.1 to 2.28.1.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.25.1...v2.28.1)

---
updated-dependencies:
- dependency-name: requests
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Koudai Aono <koxudaxi@gmail.com>