Checkout correct ref when updating to next snapshot

Author: Nanne Baars

.github/workflows/release.yml

@@ -65,7 +65,8 @@ jobs:
       name: release
     steps:
       - uses: actions/[email protected]
-        ref: 'master'
+        with:
+          ref: 'master'
 
       - name: Set up JDK 11
         uses: actions/setup-java@v2