fix(websocket): Fix leaking user_info if strdup for user or pass fails

[rtrbt]

Note

Low Risk
Low risk: small, localized change that only affects the error path when allocating username/password from a URI fails, preventing a memory leak.

Overview
Fixes a memory leak in esp_websocket_client_set_uri() when parsing userinfo from the URI: if strdup() fails for the extracted username or password, the temporary user_info buffer is now freed before returning ESP_ERR_NO_MEM.

^{Written by Cursor Bugbot for commit a79f77c. This will update automatically on new commits. Configure here.}