refactor: update Node.js version from 20 to 22 in workflow

Author: Le-Caignec

.github/workflows/safe-transaction.yml

@@ -62,7 +62,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
 
       - name: Install dependencies
         run: npm ci