fix: replace bare except with Exception in oauth.py (#22420)

* fix: replace bare except with except Exception in main.py

* fix: replace bare except with Exception in oauth.py

In Python 3, bare 'except:' is discouraged as it catches all
SystemExit and KeyboardInterrupt exceptions. Changed to 'except Exception:'
to only catch actual exceptions.

backend/open_webui/utils/oauth.py

@@ -620,7 +620,7 @@ class OAuthClientManager:
                             payload = json.loads(response_text)
                             error = payload.get("error")
                             error_description = payload.get("error_description", "")
-                        except:
+                        except Exception:
                             pass
                     else:
                         error_description = response_text