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]>

.github/workflows/lint.yml

@@ -32,7 +32,7 @@ jobs:
       run: |
         echo "::set-output name=dir::$(yarn cache dir)"
     - name: Cache Yarn dependencies
-      uses: actions/[email protected].5
+      uses: actions/[email protected].6
       with:
         path: ${{ steps.yarn-cache.outputs.dir }}
         key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
       run: |
         echo "::set-output name=dir::$(yarn cache dir)"
     - name: Cache Yarn dependencies
-      uses: actions/[email protected].5
+      uses: actions/[email protected].6
       with:
         path: ${{ steps.yarn-cache.outputs.dir }}
         key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
@@ -69,7 +69,7 @@ jobs:
       run: |
         echo "::set-output name=dir::$(yarn cache dir)"
     - name: Cache Yarn dependencies
-      uses: actions/[email protected].5
+      uses: actions/[email protected].6
       with:
         path: ${{ steps.yarn-cache.outputs.dir }}
         key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
@@ -116,7 +116,7 @@ jobs:
       run: |
         echo "::set-output name=dir::$(yarn cache dir)"
     - name: Cache Yarn dependencies
-      uses: actions/[email protected].5
+      uses: actions/[email protected].6
       with:
         path: ${{ steps.yarn-cache.outputs.dir }}
         key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}