Bump actions/cache from 2.1.6 to 2.1.7 (#16)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.6 to 2.1.7.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.6...v2.1.7)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

@@ -98,7 +98,7 @@ jobs:
       - name: Build Binary
         run: make build
       - name: Cache Artifacts
-        uses: actions/cache@v2.1.6
+        uses: actions/cache@v2.1.7
         with:
           path: ${{ github.workspace }}/build/.out/gateway
           key: nginx-gateway-kubernetes-${{ github.run_id }}-${{ github.run_number }}
@@ -111,7 +111,7 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v2
       - name: Fetch Cached Artifacts
-        uses: actions/cache@v2.1.6
+        uses: actions/cache@v2.1.7
         with:
           path: ${{ github.workspace }}/build/.out/gateway
           key: nginx-gateway-kubernetes-${{ github.run_id }}-${{ github.run_number }}