Release v2.31.0 (#59)

* Prepare release v2.31.0

* Update Nix release to 2.31.0

* flake.lock: Update

Flake lock file updates:

• Updated input 'nix':
    'https://api.flakehub.com/f/pinned/NixOS/nix/2.30.2/019842ac-bca3-782c-811a-6d2ed79b301f/source.tar.gz?narHash=sha256-U46fAs%2Bj2PfWWqP1zNi1odhnV4030SQ0RoEC8Eah1OQ%3D' (2025-07-24)
  → 'https://api.flakehub.com/f/pinned/NixOS/nix/2.31.0/0198e057-fe9f-7d26-a4c1-80c025dd6628/source.tar.gz?narHash=sha256-5JYyijH2q/uQCDIZCCyQEBsZ0VPNP2SS1wgZ4%2BqeIWM%3D' (2025-08-23)
• Updated input 'nix/nixpkgs':
    'github:NixOS/nixpkgs/adaa24fbf46737f3f1b5497bf64bae750f82942e?narHash=sha256-qhFMmDkeJX9KJwr5H32f1r7Prs7XbQWtO0h3V0a0rFY%3D' (2025-05-13)
  → 'github:NixOS/nixpkgs/cd32a774ac52caaa03bcfc9e7591ac8c18617ced?narHash=sha256-VtMQg02B3kt1oejwwrGn50U9Xbjgzfbb5TV5Wtx8dKI%3D' (2025-08-17)
• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.807117%2Brev-13e8d35b7d6028b7198f8186bc0347c6abaa2701/0198521f-ea34-74ff-8d51-3e0180a60d94/source.tar.gz?narHash=sha256-uDCFHeXdRIgJpYmtcUxGEsZ%2BhYlLPBhR83fdU%2BvbC1s%3D' (2025-07-26)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.808723%2Brev-b1b3291469652d5a2edb0becc4ef0246fff97a7c/0198daf7-011a-7703-95d7-57146e794342/source.tar.gz?narHash=sha256-wY1%2B2JPH0ZZC4BQefoZw/k%2B3%2BDowFyfOxv17CN/idKs%3D' (2025-08-23)

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

flake.lock

@@ -1,7 +1,7 @@
 {
   description = "Determinate Nix";
   inputs = {
-    nix.url = "https://flakehub.com/f/NixOS/nix/=2.30.2";
+    nix.url = "https://flakehub.com/f/NixOS/nix/=2.31.0";
     nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/*";
   };