flake/dev/flake.lock: Update

Flake lock file updates:

• Updated input 'dev-nixpkgs':
    'github:NixOS/nixpkgs/59e69648d345d6e8fef86158c555730fa12af9de?narHash=sha256-IiiXB3BDTi6UqzAZcf2S797hWEPCRZOwyNThJIYhUfk%3D' (2025-08-01)
  → 'github:NixOS/nixpkgs/fc756aa6f5d3e2e5666efcf865d190701fef150a?narHash=sha256-eogqv6FqZXHgqrbZzHnq43GalnRbLTkbBbFtEfm1RSc%3D' (2025-08-08)
• Updated input 'git-hooks':
    'github:cachix/git-hooks.nix/16ec914f6fb6f599ce988427d9d94efddf25fe6d?narHash=sha256-wibppH3g/E2lxU43ZQHC5yA/7kIKLGxVEnsnVK1BtRg%3D' (2025-06-24)
  → 'github:cachix/git-hooks.nix/9c52372878df6911f9afc1e2a1391f55e4dfc864?narHash=sha256-c6yg0EQ9xVESx6HGDOCMcyRSjaTpNJP10ef%2B6fRcofA%3D' (2025-08-05)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/58bd4da459f0a39e506847109a2a5cfceb837796?narHash=sha256-ONcNxdSiPyJ9qavMPJYAXDNBzYobHRxw0WbT38lKbwU%3D' (2025-08-01)
  → 'github:numtide/treefmt-nix/1298185c05a56bff66383a20be0b41a307f52228?narHash=sha256-B%2B3g9%2B76KlGe34Yk9za8AF3RL%2BlnbHXkLiVHLjYVOAc%3D' (2025-08-06)

Author: nixvim-ci[bot]