Bump actions/cache from 2.1.5 to 2.1.6 (#4)

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)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
       run: npm i yarn --global
 
     - name: Cache Node Modules
-      uses: actions/[email protected].5
+      uses: actions/[email protected].6
       with:
         path: .cache
         key: ${{ runner.OS }}-build-${{ hashFiles('**/yarn.lock') }}

.github/workflows/e2e.yml

@@ -20,7 +20,7 @@ jobs:
       run: npm i yarn --global
 
     - name: Cache Node Modules
-      uses: actions/[email protected].5
+      uses: actions/[email protected].6
       with:
         path: .cache
         key: ${{ runner.OS }}-build-${{ hashFiles('**/yarn.lock') }}