Bump actions/cache from v2.1.4 to v2.1.5

Bumps [actions/cache](https://github.com/actions/cache) from v2.1.4 to v2.1.5.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.4...1a9e213)

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

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
       - name: Restore cached dependencies
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.5
         with:
           path: node_modules
           key: node-modules-${{ hashFiles('package.json') }}