mattermost: jump ESR versions (9.5.x → 9.11.x)

this mirrors a change in the nixpkgs definition: the nix-update script
has a hardcoded list of attributes it will update. We can re-use one of
them to make it update mattermost's web frontend at the same time as it
updates mattermost itself.

The list of attribute names is here:
  https://github.com/Mic92/nix-update/tree/1.3.1?tab=readme-ov-file#features
original nixpkgs commit by numinit was
  1451a58a57e1bd1592460268bdde30cf72923010
  1451a58a57

pkgs/mattermost.nix

@@ -12,13 +12,13 @@ buildGoModule rec {
   # See https://docs.mattermost.com/upgrade/extended-support-release.html
   # When a new ESR version is available (e.g. 8.1.x -> 9.5.x), update
   # the version regex in passthru.updateScript as well.
-  version = "9.5.8";
+  version = "9.11.0";
 
   src = fetchFromGitHub {
     owner = "mattermost";
     repo = "mattermost";
     rev = "v${version}";
-    hash = "sha256-WK3O1t2mMqftH8EB12g1/xzQnnmJxSsBjaGrRk0Hypw=";
+    hash = "sha256-Qs5/f2wltG7HRTOVxfS+6C9CP+NR475ix/4XHezKxIc=";
   };
 
   # Needed because buildGoModule does not support go workspaces yet.
@@ -34,10 +34,10 @@ buildGoModule rec {
 
   webapp = fetchurl {
     url = "https://releases.mattermost.com/${version}/mattermost-${version}-linux-amd64.tar.gz";
-    hash = "sha256-gUp/Y0hI3oZkyTnEvyNXtHtPx77MC5zz+Z4b0FdrsqM=";
+    hash = "sha256-KT8hYVhjAvSluqnZ2IGX9RdCb8EqLtIyQuIKJkf+9No=";
   };
 
-  vendorHash = "sha256-TJCtgNf56A1U0EbV5gXjTro+YudVBRWiSZoBC3nJxnE=";
+  vendorHash = "sha256-0rxLt2ODlGsC3z5qw7m7QsverKrTtWicnHep4+fDD3M=";
 
   modRoot = "./server";
   preBuild = ''
@@ -45,6 +45,7 @@ buildGoModule rec {
   '';
 
   subPackages = [ "cmd/mattermost" ];
+  offlineCache = webapp;
 
   tags = [ "production" ];
 
@@ -69,7 +70,7 @@ buildGoModule rec {
 
   passthru = {
     updateScript = nix-update-script {
-      extraArgs = [ "--version-regex" "^v(9\.5\.([0-9.]+))" ];
+      extraArgs = [ "--version-regex" "^v(9\.11\.([0-9.]+))" ];
     };
     tests.mattermost = nixosTests.mattermost;
   };