matrix: fix elementx calls

Applies patch from: https://forgejo.ellis.link/continuwuation/continuwuity/pulls/1370
That I am working on. Also updates version to latest (at this time) git

services/matrix.nix

@@ -1,9 +1,34 @@
 {
   config,
+  pkgs,
   service_configs,
   lib,
   ...
 }:
+let
+  package =
+    let
+      src = pkgs.fetchFromGitea {
+        domain = "forgejo.ellis.link";
+        owner = "continuwuation";
+        repo = "continuwuity";
+        rev = "89ad809270dc0dbf428858a466aa9b90e9a8dccf";
+        hash = "sha256-fXLbuCkRGYljWXbCyDvczezZ3Zo8SCPh5sx1gZChccw=";
+      };
+    in
+    pkgs.matrix-continuwuity.overrideAttrs (old: {
+      inherit src;
+      cargoDeps = pkgs.rustPlatform.fetchCargoVendor {
+        inherit src;
+        name = "${old.pname}-vendor";
+        hash = "sha256-cRdjFCxk9oYKyAOB+OaFGZzpWnyKgkdz5d5XXM/QzD4=";
+      };
+
+      patches = (old.patches or [ ]) ++ [
+        ./sliding-sync-fix.patch
+      ];
+    });
+in
 {
   imports = [
     (lib.serviceMountWithZpool "continuwuity" service_configs.zpool_ssds [
@@ -16,6 +41,7 @@
 
   services.matrix-continuwuity = {
     enable = true;
+    inherit package;
 
     settings.global = {
       port = [ service_configs.ports.matrix ];