Build: Bump oauthlib from 3.3.1 to 4.0.0

Bumps [oauthlib](https://github.com/oauthlib/oauthlib) from 3.3.1 to 4.0.0.
- [Release notes](https://github.com/oauthlib/oauthlib/releases)
- [Changelog](https://github.com/oauthlib/oauthlib/blob/master/CHANGELOG.rst)
- [Commits](oauthlib/oauthlib@v3.3.1...v4.0.0)

---
updated-dependencies:
- dependency-name: oauthlib
  dependency-version: 4.0.0
  dependency-type: indirect
...

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

Author: dependabot[bot]