Fix minor bug in add_empty_commit() method

Author: CharlyReux

osv/impact_git_test.py

@@ -261,7 +261,7 @@ def test_introduced_limit_merge(self):
   def test_introduced_limit_two_linear(self):
     """Ensures that multiple introduced commit in
     the same branch are correctly handled, wrt limit."""
-    repo = TestRepository("test_introduced_limit_two_linear", debug=True)
+    repo = TestRepository("test_introduced_limit_two_linear", debug=False)
 
     first = repo.add_empty_commit(
         vulnerability=TestRepository.VulnerabilityType.INTRODUCED)

osv/test_tools/test_repository.py

@@ -74,7 +74,7 @@ def add_empty_commit(
                                        [self._initial_commit])
 
       self.repo.branches.delete('branch_temp')
-      self.create_branch('branch_{commit.hex}', commit)
+      self.create_branch(f'branch_{commit.hex}', commit)
 
     else:
       self.repo.create_branch('branch_temp',