Fix issue #641 (bitbucket.set_branching_model api) (#642)

* Targeted fix for issue #641

* * Bitbucket: fix set_branching_model method url    ✔️

Co-authored-by: Andrew Regier <[email protected]>

Author: aregier

atlassian/bitbucket/__init__.py

@@ -1945,10 +1945,13 @@ def all_branches_permissions(self, project_key, permission_id, repository_slug=N
         return self._get_paged(url)
 
     def _url_branching_model(self, project_key, repository_slug):
-        return self.resource_url(
-            "{}/branchmodel/configuration".format(self._url_repo(project_key, repository_slug)),
-            api_root="rest/branch-utils",
-            api_version="1.0",
+        return "{}/branchmodel/configuration".format(
+            self._url_repo(
+                project_key,
+                repository_slug,
+                api_root="rest/branch-utils",
+                api_version="1.0",
+            )
         )
 
     def get_branching_model(self, project_key, repository_slug):