chore(flake.lock): Update all Flake inputs (2025-04-08)

```
• Updated input 'devshell':
    'github:numtide/devshell/f7795ede5b02664b57035b3b757876703e2c3eac?narHash=sha256-tO3HrHriyLvipc4xr%2BEwtdlo7wM1OjXNjlWRgmM7peY%3D' (2024-12-31)
  → 'github:numtide/devshell/7c9e793ebe66bcba8292989a68c0419b737a22a0?narHash=sha256-kWNaq6wQUbUMlPgw8Y%2B9/9wP0F8SHkjy24/mN3UAppg%3D' (2025-03-08)
• Updated input 'fenix':
    'github:nix-community/fenix/37a1f29ebf98fbbac667730edc5dab4ebe2e3954?narHash=sha256-1tvCUR1%2B/F3IT1K4QHTcEO%2Bvsip/P1iluPIttX57Ry8%3D' (2025-02-04)
  → 'github:nix-community/fenix/7d9ba794daf5e8cc7ee728859bc688d8e26d5f06?narHash=sha256-sVuLDQ2UIWfXUBbctzrZrXM2X05YjX08K7XHMztt36E%3D' (2025-03-20)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/13c17db07b1201e3c460b4cc0ee49ac4d0ace0e5?narHash=sha256-Q4tPO6rH/q41IZG%2BNGy/Pjd2RW/bRDVjVjBh9LaVWE4%3D' (2025-02-03)
  → 'github:rust-lang/rust-analyzer/15d87419f1a123d8f888d608129c3ce3ff8f13d4?narHash=sha256-gCpvEQOrugHWLimD1wTFOJHagnSEP6VYBDspq96Idu0%3D' (2025-03-18)
• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/32ea77a06711b758da0ad9bd6a844c5740a87abd?narHash=sha256-7H9XgNiGLKN1G1CgRh0vUL4AheZSYzPm%2BzmZ7vxbJdo%3D' (2025-02-01)
  → 'github:hercules-ci/flake-parts/c621e8422220273271f52058f618c94e405bb0f5?narHash=sha256-hIshGgKZCgWh6AYJpJmRgFdR3WUbkY04o82X05xqQiY%3D' (2025-04-01)
• Updated input 'foundry-nix':
    'github:shazow/foundry.nix/33a209625b9e31227a5f11417e95a3ac7264d811?narHash=sha256-aLWyhJx2cO/M3/QLoDBpsObFfjC9e/VEN6HtaI0U6IA%3D' (2025-02-04)
  → 'github:shazow/foundry.nix/815a4d4a35ebf5c4ef855d8d4c5655fcbe63ee41?narHash=sha256-IJ2vPxTzDQNIEKScJ3JDOXBOJoXglErDeUI/I6rBOfU%3D' (2025-04-03)
• Updated input 'nixpkgs-unstable':
    'github:nixos/nixpkgs/bd3bac8bfb542dbde7ffffb6987a1a1f9d41699f?narHash=sha256-jAIUqsiN2r3hCuHji80U7NNEafpIMBXiwKlSrjWMlpg%3D' (2025-03-26)
  → 'github:nixos/nixpkgs/b0b4b5f8f621bfe213b8b21694bab52ecfcbf30b?narHash=sha256-KSlfrncSkcu1YE%2BuuJ/PTURsSlThoGkRqiGDVdbiE/k%3D' (2025-04-07)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/64dbb922d51a42c0ced6a7668ca008dded61c483?narHash=sha256-8X7tR3kFGkE7WEF5EXVkt4apgaN85oHZdoTGutCFs6I%3D' (2025-02-04)
  → 'github:numtide/treefmt-nix/815e4121d6a5d504c0f96e5be2dd7f871e4fd99d?narHash=sha256-uhjnlaVTWo5iD3LXics1rp9gaKgDRQj6660%2BgbUU3cE%3D' (2025-04-04)
```

Author: galin-s