Offering to co-maintain Configuration Override Warn

Problem/Motivation

We are using this module on around 50 projects for clients and 📌 Difference with what is now in core? Active confirmed it is still needed with Drupal 11.

The latest commit was in 2023 and there is no Drupal 11 compatible release.
I would be interested in making the module compatible with Drupal 11:

• 📌 Automated Drupal 11 compatibility fixes for config_override_warn Needs review
• 🐛 \Drupal::service('renderer')->renderPlain is deprecated since 10.3.0 Active

I also would like to help get some improvements like ✨ Warn when permissions are overridden Needs review or 🐛 Failing phpunit tests Active committed.

I feel like the code base is fairly small (mainly the FormOverrides service) and we are using most of the functionalities on client websites so I would be able to review patches and fix bugs as part of my work.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes