chore: fix branch name for release

Author: lucasls

.github/workflows/maven.yml

@@ -27,7 +27,7 @@ jobs:
       - run: mvn -B verify -Dgpg.skip=true
 
   release:
-    if: contains(github.ref, 'release') && startsWith(github.event.head_commit.message, '[release]')
+    if: contains(github.ref, 'master') && startsWith(github.event.head_commit.message, '[release]')
     runs-on: ubuntu-latest
     needs: [build]
     name: Release