fix CI: upgrade Node.js from 18 to 22 (Next.js requires >=20.9.0)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: prazgaitis

.github/workflows/test.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '22'
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
@@ -63,7 +63,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '22'
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4