flake.lock: Update (#983)

Flake lock file updates:

• Updated input 'nixos-infra':
    'github:NixOS/infra/07c76d89f710b4f5ad8cb49eb8156ca08a2d21eb?narHash=sha256-UxcB/hwSJ1sVwfJrA7xJyi/h99dGmILi0TXH2HZXan4%3D' (2025-07-19)
  → 'github:NixOS/infra/7ee3f5c95beda825b742580178f84034ec48aa9c?narHash=sha256-gUIUMsehdlB/8WKLOUTNwG1OZ/2bO7bAdmiPhHoJmns%3D' (2025-07-24)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/6e987485eb2c77e5dcc5af4e3c70843711ef9251?narHash=sha256-RKwfXA4OZROjBTQAl9WOZQFm7L8Bo93FQwSJpAiSRvo%3D' (2025-07-16)
  → 'github:NixOS/nixpkgs/7fd36ee82c0275fb545775cc5e4d30542899511d?narHash=sha256-9h7%2B4/53cSfQ/uA3pSvCaBepmZaz/dLlLVJnbQ%2BSJjk%3D' (2025-07-25)

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

Author: github-actions[bot]