Bump @actions/http-client from 1.0.3 to 1.0.8 in /packages/github (#438)

Bumps [@actions/http-client](https://github.com/actions/http-client) from 1.0.3 to 1.0.8.
- [Release notes](https://github.com/actions/http-client/releases)
- [Changelog](https://github.com/actions/http-client/blob/master/RELEASES.md)
- [Commits](https://github.com/actions/http-client/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>