Bump actions/cache from 2.1.6 to 2.1.7 (#2)

Author: dependabot[bot]

.github/workflows/build.yml

@@ -31,7 +31,7 @@ jobs:
         uses: docker/setup-buildx-action@v1.6.0
 
       - name: Cache Docker layers
-        uses: actions/cache@v2.1.6
+        uses: actions/cache@v2.1.7
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}