stubsabot: checkout the branch you were on after script completion (#8742)

scripts/stubsabot.py

@@ -483,6 +483,10 @@ async def main() -> None:
 
     denylist = {"gdb"}  # gdb is not a pypi distribution
 
+    original_branch = subprocess.run(
+        ["git", "branch", "--show-current"], text=True, capture_output=True, check=True
+    ).stdout.strip()
+
     if args.action_level >= ActionLevel.fork:
         subprocess.check_call(["git", "fetch", "--prune", "--all"])
 
@@ -523,7 +527,7 @@ async def main() -> None:
         # if you need to cleanup, try:
         # git branch -D $(git branch --list 'stubsabot/*')
         if args.action_level >= ActionLevel.local:
-            subprocess.check_call(["git", "checkout", "master"])
+            subprocess.check_call(["git", "checkout", original_branch])
 
 
 if __name__ == "__main__":