Flake lock file updates:

• Updated input 'emacs-overlay':
    'github:nix-community/emacs-overlay/84d45decb6ee4cfee67c27e0237edaae2d95af79' (2024-06-04)
  → 'github:nix-community/emacs-overlay/7ff674d6a61f4a3af339e82cfebf5e67d24d1714' (2024-06-08)
• Updated input 'emacs-overlay/nixpkgs-stable':
    'github:NixOS/nixpkgs/a62e6edd6d5e1fa0329b8653c801147986f8d446' (2024-05-31)
  → 'github:NixOS/nixpkgs/a2e1d0414259a144ebdc048408a807e69e0565af' (2024-06-04)
• Updated input 'gnu-elpa':
    'git+https://git.savannah.gnu.org/git/emacs/elpa.git?ref=main&rev=a2513013f5efde4359da0a279e43605ec3889c2d' (2024-05-28)
  → 'git+https://git.savannah.gnu.org/git/emacs/elpa.git?ref=main&rev=8e73eaf44e0ae1ac6f5cded4033cb5e312b38604' (2024-06-06)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/518daacfe2ee732432b4a7dac19b72eda037d44d' (2024-06-03)
  → 'github:NixOS/nixpkgs/121f68ed7c6c32de5a8ce91a08ef25713d1c4755' (2024-06-07)