flake.lock: Update

Flake lock file updates:

• Updated input 'nightly':
    'github:nix-community/neovim-nightly-overlay/b43af0a09c285fddfc5352fee7e41b41daef05dd?narHash=sha256-7mj1CbLcPxym%2BQkQvrZrtgeXubVFNbZSGBQhx4ULEfM%3D' (2024-09-09)
  → 'github:nix-community/neovim-nightly-overlay/b5519d5489e61ab0003a4cd36eeeacf599130bf5?narHash=sha256-hno1U7zDSAvBHPjOqIErTsjFsqYZAYp%2B6IgB0/CiPbU%3D' (2024-09-10)
• Updated input 'nightly/neovim-src':
    'github:neovim/neovim/8a2aec99748229ad9d1e12c1cbc0768d063e8eed?narHash=sha256-JCniLZOBjDY/H/lmihZ5EhPJF/1aOnEKJ1%2BXuwdjN/I%3D' (2024-09-08)
  → 'github:neovim/neovim/648d6426c863c75643d714d45f4b67e19ac6944a?narHash=sha256-DPw33pApJk%2BTmAKIIifWvD9CkLA4io3EtlkOcLtEem0%3D' (2024-09-09)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/add0443ee587a0c44f22793b8c8649a0dbc3bb00?narHash=sha256-0Kq2MkQ/sQX1rhWJ/ySBBQlBJBUK8mPMDcuDhhdBkSU%3D' (2024-09-08)
  → 'github:nixos/nixpkgs/5775c2583f1801df7b790bf7f7d710a19bac66f4?narHash=sha256-n9pCtzGZ0httmTwMuEbi5E78UQ4ZbQMr1pzi5N0LAG8%3D' (2024-09-09)