Bump actions/cache from v2 to v2.1.4 (#144)

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

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

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
         with:
           driver-opts: network=host
       - name: Cache Docker layers
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}
@@ -88,7 +88,7 @@ jobs:
         with:
           driver-opts: network=host
       - name: Cache Docker layers
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}