sources: update sources

this also disables mattermost-beta because of a version mismatch with
the development branch
will be readded with MR

hosts/hainich/configuration.nix

@@ -19,7 +19,7 @@
     ./services/monitoring.nix
     ./services/workadventure.nix
     ./services/minecraft.nix
-    ./services/mattermost.nix
+#   ./services/mattermost.nix
   ];
   boot.loader.grub.enable = true;
   boot.loader.grub.version = 2;

nix/sources.json

@@ -38,7 +38,7 @@
     "nix-hexchen": {
         "branch": "main",
         "repo": "https://gitlab.com/hexchen/nixfiles.git",
-        "rev": "0cdc8b141c112201e1fb7aff1d1bdce0406592c9",
+        "rev": "c0cb61737832d3332984b92939eb15e90ed6b8c2",
         "type": "git"
     },
     "nixos-mailserver": {
@@ -56,10 +56,10 @@
         "homepage": "",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "dec334fa196a4aeedb1b60d8f7d61aa00d327499",
-        "sha256": "1sm1p2qliz11qw6va01knm0rikhpq2h4c70ci98vi4q26y4q9z72",
+        "rev": "7c23e16b65694437fcfbc4101755934cc0f56213",
+        "sha256": "0jxbkk3ps7qw46y4awj0cbcwjva3sdr40k9psgchpcpmmjwfsjrn",
         "type": "tarball",
-        "url": "https://github.com/nixos/nixpkgs/archive/dec334fa196a4aeedb1b60d8f7d61aa00d327499.tar.gz",
+        "url": "https://github.com/nixos/nixpkgs/archive/7c23e16b65694437fcfbc4101755934cc0f56213.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs-unstable": {
@@ -68,10 +68,10 @@
         "homepage": "",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "311ceed827f531f88f46222920cd1ebb2c101f73",
-        "sha256": "1790vn4wdldgjfjgcx10pnq9hvz7ymr52xmbrkimjld1knibp0gw",
+        "rev": "0a5f5bab0e08e968ef25cff393312aa51a3512cf",
+        "sha256": "161xisa5a7wi2h5hs0p1w7zbf095w21cs0wp0524kp7p6cpvvfyn",
         "type": "tarball",
-        "url": "https://github.com/nixos/nixpkgs/archive/311ceed827f531f88f46222920cd1ebb2c101f73.tar.gz",
+        "url": "https://github.com/nixos/nixpkgs/archive/0a5f5bab0e08e968ef25cff393312aa51a3512cf.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "papermc": {