fix: handle binary data in GoogleCloudFileStore.write (#6145)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/storage/google_cloud.py

@@ -21,7 +21,8 @@ class GoogleCloudFileStore(FileStore):
 
     def write(self, path: str, contents: str | bytes) -> None:
         blob = self.bucket.blob(path)
-        with blob.open('w') as f:
+        mode = 'wb' if isinstance(contents, bytes) else 'w'
+        with blob.open(mode) as f:
             f.write(contents)
 
     def read(self, path: str) -> str: