chore(deps): bump actions/cache from 2.1.5 to 2.1.6

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.5...v2.1.6)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Get cached node modules
         id: yarn-cache-dir-path
         run: echo "::set-output name=dir::$(yarn cache dir)"
-      - uses: actions/[email protected].5
+      - uses: actions/[email protected].6
         id: yarn-cache
         with:
           path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
@@ -61,7 +61,7 @@ jobs:
       - name: Get cached node modules
         id: yarn-cache-dir-path
         run: echo "::set-output name=dir::$(yarn cache dir)"
-      - uses: actions/[email protected].5
+      - uses: actions/[email protected].6
         id: yarn-cache
         with:
           path: ${{ steps.yarn-cache-dir-path.outputs.dir }}