Bump actions/cache from v2.1.3 to v2.1.4 (#160)

Bumps [actions/cache](https://github.com/actions/cache) from v2.1.3 to v2.1.4.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.3...26968a0)

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

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

.github/workflows/tests.yml

@@ -71,7 +71,7 @@ jobs:
           print("::set-output name=result::{}".format(result))
 
       - name: Restore pre-commit cache
-        uses: actions/[email protected].3
+        uses: actions/[email protected].4
         if: matrix.session == 'pre-commit'
         with:
           path: ~/.cache/pre-commit