ci) pin node 22 for svelte tooling

.gitea/workflows/pr-checks.yml

@@ -25,6 +25,11 @@ jobs:
         with:
           bun-version: '1.3.3'
 
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+
       - name: Install dependencies
         run: bun install --frozen-lockfile