fix: Update tests workflow

.github/workflows/tests.yml

@@ -21,8 +21,9 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
+          cache: 'yarn'
       - name: Install dependencies
-        run: yarn
+        run: yarn --frozen-lockfile
       - name: Run eslint
         run: yarn run eslint
   integration:
@@ -37,6 +38,7 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
+          cache: 'yarn'
       - name: Install dependencies plugin
         run: yarn --no-lockfile --unsafe-perm --production
       - name: Install dependencies playground