chore: drop Node 12 support (#8299)

This patches removes support for Node 12.

BREAKING CHANGE: Node 12 is no longer supported.

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         # Include all major maintenance + active LTS + current Node.js versions.
         # https://github.com/nodejs/Release#release-schedule
-        node: [12, 14, 16]
+        node: [14, 16]
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -111,7 +111,7 @@ jobs:
         with:
           # Test only the oldest maintenance LTS Node.js version.
           # https://github.com/nodejs/Release#release-schedule
-          node-version: 12
+          node-version: 14
 
       - name: Install dependencies
         run: |
@@ -152,7 +152,7 @@ jobs:
         with:
           # Test only the oldest maintenance LTS Node.js version.
           # https://github.com/nodejs/Release#release-schedule
-          node-version: 12
+          node-version: 14
 
       - name: Install dependencies
         run: |