chore(flake): update flake.lock (#327)

Flake lock file updates:

• Updated input 'emacs-overlay':
    'github:nix-community/emacs-overlay/baf779480d5a7adc11a5e7439a088855051024bf?narHash=sha256-0vfwBbuIoGys%2Bpbl1gFeP68jqh7azbrOChW2SKzKjDk%3D' (2024-05-04)
  → 'github:nix-community/emacs-overlay/62004f5ead76e154c4f19e27a94cd24fb4db59aa?narHash=sha256-3uhiVHNP/lfki1w4eKUgpBGyoPbbgYCgwWWgn%2BLUoIA%3D' (2024-05-11)
• Updated input 'emacs-overlay/nixpkgs-stable':
    'github:NixOS/nixpkgs/0638fe2715d998fa81d173aad264eb671ce2ebc1?narHash=sha256-ILsf3bdY/hNNI/Hu5bSt2/KbmHaAVhBbNUOdGztTHEg%3D' (2024-05-01)
  → 'github:NixOS/nixpkgs/9a9960b98418f8c385f52de3b09a63f9c561427a?narHash=sha256-R98WOBHkk8wIi103JUVQF3ei3oui4HvoZcz9tYOAwlk%3D' (2024-05-09)
• Updated input 'gnu-elpa':
    'git+https://git.savannah.gnu.org/git/emacs/elpa.git?ref=main&rev=9f03484eee87d0b311fbf06de4ce6a96cde160cc' (2024-05-01)
  → 'git+https://git.savannah.gnu.org/git/emacs/elpa.git?ref=main&rev=f2007eb074389780351fb0f179f6c9e4c96f9b88' (2024-05-09)
• Updated input 'melpa':
    'github:melpa/melpa/1206dea4f7040221775b315fd1e858448ca3dde6?narHash=sha256-hAVdw3p96ZnxN2PhtOhHEmSrVbhlhOFByq94n8xugTI%3D' (2024-05-03)
  → 'github:melpa/melpa/0fe4a5498ca9860d8b06d48f643e87d32f416f84?narHash=sha256-3Js9GnFh7wSAehjPiAwTiAy5ZH118xdLj70POvn1fEk%3D' (2024-05-05)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/374e9f9db905676fb37d1c53b60e3c818f5b0924?narHash=sha256-q3tjBaPKyrbOpzjMxdLmjXlpyNZ9FniZF47GnQ75sts%3D' (2024-05-04)
  → 'github:NixOS/nixpkgs/13327288b41e9d654372cd7d29a81c08f322da1b?narHash=sha256-Hw492Uajf305yBMOo6/gW9P1hpgqzX3cZyZyJBJ9bG8%3D' (2024-05-11)

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