chore: Remove node v12.x from CI workflow

.github/workflows/publish_and_install.yml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [12.x, 14.x, 16.x]
+        node-version: [14.x, 16.x]
       fail-fast: false
     steps:
     - uses: actions/checkout@v2