Update CI to Node.js 22 for conformance package compatibility

The @modelcontextprotocol/conformance@0.1.16 package uses fs.globSync
which requires Node.js 22+.

Author: Tarek Mahmoud Sayed

.github/workflows/ci-build-test.yml

@@ -52,7 +52,7 @@ jobs:
     - name: 🔧 Set up Node.js
       uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
       with:
-        node-version: '20'
+        node-version: '22'
 
     - name: 📦 Install pinned npm dependencies for tests
       run: npm ci