Bump @actions/core from 1.6.0 to 1.9.1

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.6.0 to 1.9.1.
- [Release notes](https://github.com/actions/toolkit/releases)
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/core/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/core)

---
updated-dependencies:
- dependency-name: "@actions/core"
  dependency-type: indirect
...

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