flake.lock: Update

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/b1d9ab70662946ef0850d488da1c9019f3a9752a' (2024-03-11)
  → 'github:numtide/flake-utils/11707dc2f618dd54ca8739b309ec4fc024de578b' (2024-11-13)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/58a1abdbae3217ca6b702f03d3b35125d88a2994' (2024-04-27)
  → 'github:NixOS/nixpkgs/6e987485eb2c77e5dcc5af4e3c70843711ef9251' (2025-07-16)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/3e416d5067ba31ff8ac31eeb763e4388bdf45089' (2024-05-02)
  → 'github:oxalica/rust-overlay/742248f12aed0183a124637e8b27a238a47f46a2' (2025-07-19)
• Removed input 'rust-overlay/flake-utils'
• Removed input 'rust-overlay/flake-utils/systems'
• Updated input 'rust-overlay/nixpkgs':
    'github:NixOS/nixpkgs/90f456026d284c22b3e3497be980b2e47d0b28ac' (2024-01-29)
  → 'github:NixOS/nixpkgs/18dd725c29603f582cf1900e0d25f9f1063dbf11' (2025-04-13)

Author: github-actions[bot]