Update release action

Author: AstroPatty

.github/workflows/release.yaml

@@ -5,6 +5,8 @@ on:
       - '[0-9]+.[0-9]+.[0-9]+'
       - '[0-9]+.[0-9]+.[0-9]+b[0-9]+'
       - '[0-9]+.[0-9]+.[0-9]+rc[0-9]+'
+    branches:
+      - release
 jobs:
   check-pyproject-version:
     runs-on: ubuntu-latest