Fix lint (#8060)

openhands/runtime/impl/local/local_runtime.py

@@ -70,7 +70,7 @@ def check_dependencies(code_repo_path: str, poetry_venvs_path: str):
     server = libtmux.Server()
     try:
         session = server.new_session(session_name='test-session')
-    except Exception as e:
+    except Exception:
         raise ValueError('tmux is not properly installed or available on the path.')
     pane = session.attached_pane
     pane.send_keys('echo "test"')