chore: update rector version

Author: kenjis

.github/workflows/rector.yml

@@ -63,5 +63,5 @@ jobs:
 
       - name: Analyze for refactoring
         run: |
-          composer global require --dev rector/rector:^0.13.3
+          composer global require --dev rector/rector:^0.15.1
           rector process --dry-run --no-progress-bar