Bumps actions/cache](https://github.com/actions/cache)) from 2.1.5 to 2.1.6. - Release notes](https://github.com/actions/cache/releases)) - Commits](https://github.com/actions/cache/compare/v2.1.5...v2.1.6))
Signed-off-by: dependabot[bot] <support@github.com>