Build(deps): Bump actions/cache from 2.1.5 to 2.1.6 (#10965)

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>

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

.github/workflows/prod-test.yml

@@ -23,7 +23,7 @@ jobs:
 
       - name: Cache Build Results
         id: build-cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: .cache
           key: v2-build-cache-${{ hashFiles('yarn.lock') }}-${{ hashFiles('scripts/build/**/*') }}-${{ github.ref }}-