Chore(deps): Bump actions/cache from v2 to v2.1.4 (#30973)

Bumps [actions/cache](https://github.com/actions/cache) from v2 to v2.1.4.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2...26968a09c0ea4f3e233fdddbafd1166051a095f6)

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

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

.github/workflows/publish.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v1
     - run: git clone --single-branch --no-tags --depth 1 -b master https://grafanabot:${{ secrets.GH_BOT_ACCESS_TOKEN }}@github.com/grafana/website-sync ./.github/actions/website-sync
-    - uses: actions/cache@v2
+    - uses: actions/cache@v2.1.4
       with:
         path: '**/node_modules'
         key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}