fix: Use Node.js 22 in regen workflow for grpc-tools compatibility

Author: erezrokah

.github/workflows/regen.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
           cache: 'pnpm'
-          node-version: "24"
+          node-version: "22"
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile