text: Title: password_scheme	[ '"sha512crypt" is not a valid choice.' ]
  Body: # Impacted versions
  
  * OS Type: 			Debian
  * OS Version: 		12
  * Database Type: 	postgres
  * Database version:	15.6
  * Modoboa:  		2.2.4
  * installer used: 		yes
  * Webserver: 		nginx
  # Steps to reproduce
  
  1. login into a new-admin
  2. go to /new-admin/parameters/core (go to settings > general)
  3. ctrl+shift+k (open debug console in your browser)
  4. no need to change anything, just click on the green floppy disk icon in bottom right corner and then see response from the server indicating failure
  
  # Current behavior
  this was installed yesterday, almost everything is in default settings (except maybe for importing users and domains CSVs)
  I believe that this might be caused by the users csv import, but i tried to remove those.
  <!--
  
    Explain the behavior you're seeing that you think is a bug, and explain how you
    think things should behave instead.
  
  -->
  
  ## Response
  ```XHRPUT
  XHRPUT
  https://mail.<blablabla>/api/v2/parameters/core/
  [HTTP/2 400  112ms]
  
  	
  password_scheme	[ '"sha512crypt" is not a valid choice.' ]
  ```
  
  # Expected behavior
  status 200
  # Video/Screenshot link (optional)
  ![Screenshot_20240411_133221](https://github.com/modoboa/modoboa/assets/120217643/547de2c7-8cf0-4780-8677-ba744f72d584)
  