nixos/dovecot: update for 2.4

Author: Jappie3

nixos/doc/manual/release-notes/rl-2511.section.md

@@ -509,6 +509,8 @@ and [release notes for v18](https://goteleport.com/docs/changelog/#1800-070325).
 - Potential race conditions in the network setup when using `networking.interfaces` have been fixed by disabling duplicate address detection (DAD)
   for statically configured IPv6 addresses.
 
+- `services.dovecot` now supports the Dovecot 2.4 configuration format while maintaining compatibility with Dovecot 2.3.
+
 - `strongSwan` has been updated to 6.0. See [strongSwan 6.0.0 release notes](https://github.com/strongswan/strongswan/releases/tag/6.0.0) for a complete list of changes.
 
 - `slurm` no longer supports gtk2.