build(nix): update input dep versions

Flake lock file updates:

• Updated input 'bun2nix':
    'github:baileyluTCD/bun2nix/85d692d68a5345d868d3bb1158b953d2996d70f7?narHash=sha256-rUpcATQ0LiY8IYRndqTlPUhF4YGJH3lM2aMOs5vBDGM%3D' (2025-06-23)
  → 'github:baileyluTCD/bun2nix/72c047583edc83e2c2eada6e348dfaa622781331?narHash=sha256-ZO7dOTEipchkK/2mX6uAGbe6zQXnvHr40ri6jOztNR4%3D' (2025-09-17)
• Updated input 'crane':
    'github:ipetkov/crane/305707bbc27d83aa1039378e91d7dd816f4cac10?narHash=sha256-dpBFe8SqYKr7W6KN5QOVCr8N76SBKwTslzjw%2B4BVBVs%3D' (2025-09-01)
  → 'github:ipetkov/crane/a669fe77a8b0cd6f11419d89ea45a16691ca5121?narHash=sha256-8nkzkPbdxze8CxWhKWlcLbJEU1vfLM/nVqRlTy17V54%3D' (2025-09-18)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/d0fc30899600b9b3466ddb260fd83deb486c32f1?narHash=sha256-rw/PHa1cqiePdBxhF66V7R%2BWAP8WekQ0mCDG4CFqT8Y%3D' (2025-09-02)
  → 'github:nixos/nixpkgs/8eaee110344796db060382e15d3af0a9fc396e0e?narHash=sha256-iCGWf/LTy%2BaY0zFu8q12lK8KuZp7yvdhStehhyX1v8w%3D' (2025-09-19)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/4486e04adbb4b0e39f593767f2c36e2211003d01?narHash=sha256-qm53%2BEUFfzyF8F0MEscHGqf9tx462GV3/zUZrn9wiQU%3D' (2025-09-05)
  → 'github:oxalica/rust-overlay/f1ccb14649cf87e48051a6ac3a571b4a57d84ff3?narHash=sha256-2jaGMj32IckpZgBjn7kG4zyJl66T%2B2A1Fn2ppkHh91o%3D' (2025-09-20)

Author: github-actions[bot]