nextcloud22: init at 22.0.0

Simplified, non-breaking version of e05f4101c16f08058a14ac4335886567e1ffe987.

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

@@ -92,7 +92,7 @@ in {
     package = mkOption {
       type = types.package;
       description = "Which package to use for the Nextcloud instance.";
-      relatedPackages = [ "nextcloud19" "nextcloud20" "nextcloud21" ];
+      relatedPackages = [ "nextcloud19" "nextcloud20" "nextcloud21" "nextcloud22" ];
     };
 
     maxUploadSize = mkOption {
@@ -385,7 +385,7 @@ in {
       ];
 
       warnings = let
-        latest = 21;
+        latest = 22;
         upgradeWarning = major: nixos:
           ''
             A legacy Nextcloud install (from before NixOS ${nixos}) may be installed.

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

@@ -11,8 +11,8 @@
   desktop client is packaged at <literal>pkgs.nextcloud-client</literal>.
  </para>
  <para>
-  The current default by NixOS is <package>nextcloud21</package> which is also the latest
-  major version available.
+  The current default by NixOS is <package>nextcloud21</package>. The latest version available is
+  <package>nextcloud22</package>.
  </para>
  <section xml:id="module-services-nextcloud-basic-usage">
   <title>Basic usage</title>