flake.lock: Update (#491)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/705e07d87df327c6e74add1be99c65cfee21cacf?narHash=sha256-BB67RIHP2SYVocjoFaJ6OUmHItF42sNcLO/330DHWn8%3D' (2025-02-11)
  → 'github:nix-community/neovim-nightly-overlay/c689a1c053b079dc95231ab4d800e7d3cf13c0ce?narHash=sha256-Cdd%2BpLWebuEld9BZ0kmbBjZ2HftudKcv2A6oK5htO1E%3D' (2025-02-13)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/c7d13f2895fa657ff3d9d45741f9abec25072b56?narHash=sha256-nxQ0sMFIqSTuD8C%2BAsS6DcMYQbmi4ZWmkGyrqJh/D1Y%3D' (2025-02-10)
  → 'github:neovim/neovim/8117db48ed5939dcb93e84f6e740c1b46317dd31?narHash=sha256-nJJYoMft/JxPwHvIW3mv/SVHlGBEsCeE7rnSJJsKBII%3D' (2025-02-12)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/fa35a3c8e17a3de613240fea68f876e5b4896aec?narHash=sha256-7Fu7oazPoYCbDzb9k8D/DdbKrC3aU1zlnc39Y8jy/s8%3D' (2025-02-08)
  → 'github:NixOS/nixpkgs/b2243f41e860ac85c0b446eadc6930359b294e79?narHash=sha256-M4ilIfGxzbBZuURokv24aqJTbdjPA9K%2BDtKUzrJaES4%3D' (2025-02-09)

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

Author: mrcjkb