removing unsupported node version by upstream libheif

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12, 14, 16, 18, 20]
+        node-version: [16, 18, 20]
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
@@ -33,10 +33,10 @@ jobs:
     needs: test
     steps:
       - uses: actions/checkout@v4
-      - name: Use Node.js 14
+      - name: Use Node.js 18
         uses: actions/setup-node@v3
         with:
-          node-version: 14
+          node-version: 18
           registry-url: https://registry.npmjs.org/
       - run: npm install
       - run: npm run fetch