chore: Prepare SSO branch for release

configuration.nix

@@ -139,7 +139,7 @@ in
     pkgs.writeShellScript "flake-update-script" ''
       set -o xtrace
       if ${config.nix.package.out}/bin/nix flake update \
-      --override-input selfprivacy-nixos-config git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=sso
+      --override-input selfprivacy-nixos-config git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes
       then
           if ${pkgs.diffutils}/bin/diff -u -r /etc/selfprivacy/nixos-config-source/ /etc/nixos/
           then

flake.lock

@@ -45,11 +45,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1745582529,
+        "lastModified": 1745582811,
         "narHash": "sha256-UxglxWAqX/yQBn7065kbQyd2LGEQrnxkR+9WjJt2fWM=",
-        "ref": "def/add_users_repositories",
-        "rev": "4d32f026e6727005b18f02963b312db5f8d00177",
-        "revCount": 1771,
+        "ref": "master",
+        "rev": "3bb5e09588c0a60149eea520844fb80eb86f8bdb",
+        "revCount": 1772,
         "type": "git",
         "url": "https://git.selfprivacy.org/SelfPrivacy/selfprivacy-rest-api.git"
       },