Update synchronise.yml

Author: TimoMolls

.github/workflows/synchronise.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@v4.0.2
         with:
-          node-version: 18.17.x
+          node-version: 20.15.x
           cache: npm
       - name: Install
         run: npm install