Bump actions/cache from 2.1.6 to 2.1.7 (#132)

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>

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
       run: go mod download
 
     - name: Cache modules
-      uses: actions/cache@v2.1.6
+      uses: actions/cache@v2.1.7
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.OS }}-go-${{ hashFiles('**/go.sum') }}