flake.lock: Update

Flake lock file updates:

• Updated input 'nightly':
    'github:nix-community/neovim-nightly-overlay/1c6233fd50d535b739293bd6b73905727de0e6c9?narHash=sha256-jZf0VgZIT5ReUnannAoCKzd/8uyj1I1UJKopNhvxUY0%3D' (2024-09-02)
  → 'github:nix-community/neovim-nightly-overlay/fdc7d407e29b17633d2568b5f46ead383ef85172?narHash=sha256-F5Obt4M07Jal6P0QMkbL9Qrsux7CmhbmEuO4d1NWOrk%3D' (2024-09-04)
• Updated input 'nightly/neovim-src':
    'github:neovim/neovim/bcae8be91f9fd4967f0c6f6ffabf59702253949b?narHash=sha256-VAxAZTUjPR4GNMGqGp%2B/cLs83bHHDTCTxaADnBOOoaE%3D' (2024-09-01)
  → 'github:neovim/neovim/7b7c95dac97d6ea4f10855cc198dce650a796c20?narHash=sha256-FEwqYuoLu5gZ6Kc8DWTKAWAR0iZ6dSvdIC9RARLKhWc%3D' (2024-09-03)
• Updated input 'nightly/nixpkgs':
    'github:NixOS/nixpkgs/4a9443e2a4e06cbaff89056b5cdf6777c1fe5755?narHash=sha256-/ZeccCYM71zfJ17gEQ0U/XzJr4kN0VXUiUeJ2mKxLJU%3D' (2024-09-01)
  → 'github:NixOS/nixpkgs/b833ff01a0d694b910daca6e2ff4a3f26dee478c?narHash=sha256-tLGCFEFTB5TaOKkpfw3iYT9dnk4awTP/q4w%2BROpMfuw%3D' (2024-09-01)