[Security] Bump @actions/http-client from 1.0.6 to 1.0.8

Bumps [@actions/http-client](https://github.com/actions/http-client) from 1.0.6 to 1.0.8. **This update includes a security fix.**
- [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-preview[bot] <support@dependabot.com>