flake.lock: Update (#1982)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/275782673cefcdad61a446c3ab94312213b52562?narHash=sha256-JTvHbro7zygxdBIgvfaTBK30PyBYSIgpmwv8EkObje8%3D' (2025-10-19)
  → 'github:nixos/nixpkgs/dd53d07829373e8097ab457fa2b73cc7741163c5?narHash=sha256-r8pBQOGHyt4VUDn/ahz9ZiXeCkbhYEDhSS2J%2Blwg6NI%3D' (2025-10-26)

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Author: github-actions[bot]