ci: update Node.js versions supported and remove legacy step (#1599)

.github/workflows/ci.yml

@@ -19,14 +19,12 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [18, 20, 22]
+        node-version: [18, 19, 20, 21, 22, 23]
 
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - run: npm install -g npm@^8
-        if: matrix.node-version == '14.x'
       - run: npm ci
       - run: npm test