Update pytest.yml to run on vX.Y.Z branches

Author: takishida

.github/workflows/pytest.yml

@@ -2,9 +2,9 @@ name: Pytest
 
 on:
   push:
-    branches: [master]
+    branches: [master, 'v[0-9].[0-9]+.[0-9]+*']
   pull_request:
-    branches: [master]
+    branches: [master, 'v[0-9].[0-9]+.[0-9]+*']
 
 permissions:
   contents: read