[DEPENDABOT]: Bump actions/cache from 2.1.6 to 2.1.7 (#829)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.6 to 2.1.7.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.6...v2.1.7)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

.github/workflows/run_tests.yml

@@ -93,7 +93,7 @@ jobs:
                   print("::set-output name=result::{}".format(result))
 
             - name: Restore pre-commit cache
-              uses: actions/cache@v2.1.6
+              uses: actions/cache@v2.1.7
               if: matrix.session == 'pre-commit'
               with:
                   path: ~/.cache/pre-commit