chore(ga): bump actions/cache from 2.1.6 to 2.1.7

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>

.github/workflows/benchmarks.yml

@@ -30,7 +30,7 @@ jobs:
           extensions: bcmath, mbstring, intl, sodium, json
 
       - name: "caching dependencies"
-        uses: "actions/cache@v2.1.6"
+        uses: "actions/cache@v2.1.7"
         with:
           path: |
             ~/.composer/cache

.github/workflows/unit-tests.yml

@@ -32,7 +32,7 @@ jobs:
           extensions: bcmath, mbstring, intl, sodium, json
 
       - name: "caching dependencies"
-        uses: "actions/cache@v2.1.6"
+        uses: "actions/cache@v2.1.7"
         with:
           path: |
             ~/.composer/cache