fix: use pnpm in CI and drop EOL Node 14.x/16.x

Author: liuxy0551

.github/workflows/CI.yml

@@ -12,17 +12,23 @@ jobs:
 
         strategy:
             matrix:
-                node-version: [14.x, 16.x, 18.x, 20.x]
+                node-version: [18.x, 20.x]
 
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@v4
+
+            - name: Install pnpm
+              uses: pnpm/action-setup@v4
+              with:
+                  version: 9
 
             - name: Use Node.js ${{ matrix.node-version }}
-              uses: actions/setup-node@v3
+              uses: actions/setup-node@v4
               with:
                   node-version: ${{ matrix.node-version }}
+                  cache: "pnpm"
 
             - name: Build
               run: |
-                  npm install
+                  pnpm install
                   tsc -p tsconfig.json