flake.lock: Update (#351)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/b5519d5489e61ab0003a4cd36eeeacf599130bf5?narHash=sha256-hno1U7zDSAvBHPjOqIErTsjFsqYZAYp%2B6IgB0/CiPbU%3D' (2024-09-10)
  → 'github:nix-community/neovim-nightly-overlay/e2aaa29736ba7200012470f818f9111e41b77c1a?narHash=sha256-6pXnXYAKIkAQWzfbSBMTDlw2moyvSqZiR6QltTCi4jw%3D' (2024-09-12)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/648d6426c863c75643d714d45f4b67e19ac6944a?narHash=sha256-DPw33pApJk%2BTmAKIIifWvD9CkLA4io3EtlkOcLtEem0%3D' (2024-09-09)
  → 'github:neovim/neovim/98ba65b8be8cb2dde839502357e70916c4a3e37a?narHash=sha256-cW8RaE7XDx95GMhWF01fGe9j1thysEMiovnDGzCH7jk%3D' (2024-09-11)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/add0443ee587a0c44f22793b8c8649a0dbc3bb00?narHash=sha256-0Kq2MkQ/sQX1rhWJ/ySBBQlBJBUK8mPMDcuDhhdBkSU%3D' (2024-09-08)
  → 'github:NixOS/nixpkgs/159be5db480d1df880a0135ca0bfed84c2f88353?narHash=sha256-LnNKCCxnwgF%2B575y0pxUdlGZBO/ru1CtGHIqQVfvjlA%3D' (2024-09-11)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/5775c2583f1801df7b790bf7f7d710a19bac66f4?narHash=sha256-n9pCtzGZ0httmTwMuEbi5E78UQ4ZbQMr1pzi5N0LAG8%3D' (2024-09-09)
  → 'github:nixos/nixpkgs/159be5db480d1df880a0135ca0bfed84c2f88353?narHash=sha256-LnNKCCxnwgF%2B575y0pxUdlGZBO/ru1CtGHIqQVfvjlA%3D' (2024-09-11)

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