Bump @actions/github from 2.1.1 to 4.0.0

Bumps [@actions/github](https://github.com/actions/toolkit/tree/HEAD/packages/github) from 2.1.1 to 4.0.0.
- [Release notes](https://github.com/actions/toolkit/releases)
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/github/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/github)

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

Author: dependabot[bot]