chore: use specific exceptions instead of generic

Signed-off-by: Zack Koppert <zkoppert@github.com>

open_contrib_pr.py

@@ -154,7 +154,7 @@ def clone_repository(gh_actor, token, endpoint, repo):
     repo_name = repo["name"]
     try:
         os.system(f"git clone https://{gh_actor}:{token}@{endpoint}/{repo_full_name}")
-    except Exception as e:  # pylint: disable=broad-exception-caught
+    except OSError as e:
         print(f"Failed to clone repository: {e}")
         return None
     return repo_name

test_open_contrib_pr.py

@@ -65,7 +65,7 @@ class TestCloneRepository(unittest.TestCase):
         """
         Test the clone_repository function when the clone fails.
         """
-        mock_system.side_effect = Exception("Clone failed")  # Simulate clone failure
+        mock_system.side_effect = OSError("Clone failed")  # Simulate clone failure
 
         result = clone_repository(
             gh_actor="test_actor",