Bump github-buttons from 2.20.1 to 2.20.2

Bumps [github-buttons](https://github.com/ntkme/github-buttons) from 2.20.1 to 2.20.2.
- [Release notes](https://github.com/ntkme/github-buttons/releases)
- [Commits](buttons/github-buttons@v2.20.1...v2.20.2)

---
updated-dependencies:
- dependency-name: github-buttons
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]