nixos/nextcloud: php83 for nc29, update release notes

* PHP 8.3 seems supported, so let's go for it!

* The conditions for which Nextcloud will be the default were bogus: for
  <24.11 I'd suggest to go for nextcloud29 already. The people on
  unstable relying on the condition were on nextcloud28 so the upgrade
  will work fine.

  Also, it's unstable, so such upgrades are to be expected IMHO.

* Update the release notes to reflect that the new default is Nextcloud
  29 and warn that only one major upgrade at a time can be done.

nixos/doc/manual/release-notes/rl-2405.section.md

@@ -331,11 +331,11 @@ The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been m
 
 - The `gtest` package has been updated past v1.13.0, which requires C++14 or higher.
 
-- The latest available version of Nextcloud is v28 (available as `pkgs.nextcloud28`). The installation logic is as follows:
+- The latest available version of Nextcloud is v29 (available as `pkgs.nextcloud29`). The installation logic is as follows:
   - If [`services.nextcloud.package`](#opt-services.nextcloud.package) is specified explicitly, this package will be installed (**recommended**)
-  - If [`system.stateVersion`](#opt-system.stateVersion) is >=24.05, `pkgs.nextcloud28` will be installed by default.
+  - If [`system.stateVersion`](#opt-system.stateVersion) is >=24.05, `pkgs.nextcloud29` will be installed by default.
   - If [`system.stateVersion`](#opt-system.stateVersion) is >=23.11, `pkgs.nextcloud27` will be installed by default.
-  - Please note that an upgrade from v26 (or older) to v28 directly is not possible. Please upgrade to `nextcloud27` (or earlier) first. Nextcloud prohibits skipping major versions while upgrading. You can upgrade by declaring [`services.nextcloud.package = pkgs.nextcloud27;`](options.html#opt-services.nextcloud.package).
+  - Please note that an upgrade from v27 (or older) to v29 directly is not possible. Please upgrade to `nextcloud28` (or earlier) first. Nextcloud prohibits skipping major versions while upgrading. You can upgrade by declaring [`services.nextcloud.package = pkgs.nextcloud28;`](options.html#opt-services.nextcloud.package).
 
 - The vendored third party libraries have been mostly removed from `cudaPackages.nsight_systems`, which we now only ship for `cudaPackages_11_8` and later due to outdated dependencies. Users comfortable with the vendored dependencies may use `overrideAttrs` to amend the `postPatch` phase and the `meta.broken` correspondingly. Alternatively, one could package the deprecated `boost170` locally, as required for `cudaPackages_11_4.nsight_systems`.
 

nixos/modules/services/web-apps/nextcloud.md

@@ -5,7 +5,7 @@ self-hostable cloud platform. The server setup can be automated using
 [services.nextcloud](#opt-services.nextcloud.enable). A
 desktop client is packaged at `pkgs.nextcloud-client`.
 
-The current default by NixOS is `nextcloud28` which is also the latest
+The current default by NixOS is `nextcloud29` which is also the latest
 major version available.
 
 ## Basic usage {#module-services-nextcloud-basic-usage}

nixos/modules/services/web-apps/nextcloud.nix

@@ -833,11 +833,12 @@ in {
           else if versionOlder stateVersion "23.05" then nextcloud25
           else if versionOlder stateVersion "23.11" then nextcloud26
           else if versionOlder stateVersion "24.05" then nextcloud27
-          else if versionOlder stateVersion "24.11" then nextcloud28
           else nextcloud29
         );
 
-      services.nextcloud.phpPackage = pkgs.php82;
+      services.nextcloud.phpPackage =
+        if versionOlder cfg.package.version "29" then pkgs.php82
+        else pkgs.php83;
 
       services.nextcloud.phpOptions = mkMerge [
         (mapAttrs (const mkOptionDefault) defaultPHPSettings)