Use fallback value for charset, url_charset and encoding_errors
Werkzeug 3.0 removes those attributes.
Closes #12604 (closed) (grafted from 0f5c7ceb4ea7)
This instance will be upgraded to Heptapod 1.5.0rc (GitLab 16.11.1) on 2024-05-02 at 15:00 UTC+2
Werkzeug 3.0 removes those attributes.
Closes #12604 (closed) (grafted from 0f5c7ceb4ea7)