Update GitHub Actions to Node.js 22.x and latest action versions

- Update Node.js version from 12.x to 22.x (current LTS)
- Update actions/checkout from v2 to v4
- Update actions/setup-node from v2 to v4
- Fixes npm compatibility issues with modern package-lock.json

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: bfirsh

.github/workflows/ci.yaml

@@ -8,11 +8,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Use Node.js
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
-          node-version: '12.x'
+          node-version: '22.x'
       - run: npm ci
       - run: npm run build
       - run: npm test