fix: Wrong post (#1169)

Author: gabyx

atlassian/bitbucket/__init__.py

@@ -1699,7 +1699,7 @@ def update_pull_request(self, project_key, repository_slug, pull_request_id, dat
         """
 
         url = self._url_pull_request(project_key, repository_slug, pull_request_id)
-        return self.post(url, data=data)
+        return self.put(url, data=data)
 
     def delete_pull_request(
         self,