tutor/changelog.d/20240130_123351_regis_fix_save_on_plugins.md

• [Bugfix] Actually update the environment on tutor plugins enable .... (by @regisb)
• [Feature] Introduce a tutor.hooks.lru_cache decorator that is automatically cleared whenever a plugin is loaded or unloaded. This is useful, in particular when a plugin implements a costly function that depends on tutor hooks. (by @regisb)