Update actions/core dependencies for releases/v2 (#713)

.github/workflows/e2e-cache.yml

@@ -75,7 +75,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [12, 14, 16]
+        node-version: [14, 16]
     steps:
       - uses: actions/checkout@v2
       - name: Yarn version