flake.lock: Update (#2378)

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/296d44c440302980824c5f3b67e477cf0522e0c1?narHash=sha256-FaXZZLLDW1D%2Bpj7UgrIslDS8XjMMG3Pus5gAvUYWQS0%3D' (2024-08-13)
  → 'github:nix-community/fenix/0df8ceddac0e11b695fd622e18908724cc478552?narHash=sha256-0BQ6BZPaDq8rtEIdTduF2OPlQUKEkImKI8oysym9EVM%3D' (2024-08-31)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/32a86cb1dad2b208e8f36f1bb50c2e4806b0371f?narHash=sha256-Ls0e6R4FmGUFXZlUcm6ZQaVNJ4Yj/nua4SSctXIopao%3D' (2024-08-12)
  → 'github:rust-lang/rust-analyzer/9fd70519507b673fae250f84b0990e7e8155ca98?narHash=sha256-h8Pn1th2bss7yXvxs1uR1kXYMTNej1L6Qy/GgsR4t3A%3D' (2024-08-30)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/4877ea239f4d02410c3516101faf35a81af0c30e?narHash=sha256-LrmeqqHdPgAJsVKIJja8jGgRG/CA2y6SGT2TjX5Do68%3D' (2024-08-13)
  → 'github:NixOS/nixpkgs/5629520edecb69630a3f4d17d3d33fc96c13f6fe?narHash=sha256-CHgumPZaC7z%2BWYx72WgaLt2XF0yUVzJS60rO4GZ7ytY%3D' (2024-08-31)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>