flake.lock: Update (#831)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/f64796929ddee4ba1159ea5d1ab6b1bfc1d523e9?narHash=sha256-iiYLm2JrIPtahwOEv%2B0/dFnkKziiJQectkGvdJxFnT0%3D' (2026-02-07)
  → 'github:nix-community/neovim-nightly-overlay/0bb52596f3ea543781d2c20b1c2ee495a174a7d5?narHash=sha256-YsfKRbd5fbcb2VTxywzAGpc4txXApMXfG0vtxEldt7Q%3D' (2026-02-08)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/7720e52a0b4aa973540934ab6dcf4703dbde3b9f?narHash=sha256-BuljN%2BJ1f1vVRUV1FqOwhHUdp%2BV2VX150JsSORiN9gA%3D' (2026-02-06)
  → 'github:neovim/neovim/ed8fbd2e2992cb264cb62585098a1c7acc5c4585?narHash=sha256-HvlTxVEso/hl9lwweHerBRLtI/q05SQTxDr2l0Njfig%3D' (2026-02-07)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/aa290c9891fa4ebe88f8889e59633d20cc06a5f2?narHash=sha256-awR8qIwJxJJiOmcEGgP2KUqYmHG4v/z8XpL9z8FnT1A%3D' (2026-02-04)
  → 'github:NixOS/nixpkgs/ae67888ff7ef9dff69b3cf0cc0fbfbcd3a722abe?narHash=sha256-P7dWMHRUWG5m4G%2B06jDyThXO7kwSk46C1kgjEWcybkE%3D' (2026-02-06)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/aa290c9891fa4ebe88f8889e59633d20cc06a5f2?narHash=sha256-awR8qIwJxJJiOmcEGgP2KUqYmHG4v/z8XpL9z8FnT1A%3D' (2026-02-04)
  → 'github:nixos/nixpkgs/ae67888ff7ef9dff69b3cf0cc0fbfbcd3a722abe?narHash=sha256-P7dWMHRUWG5m4G%2B06jDyThXO7kwSk46C1kgjEWcybkE%3D' (2026-02-06)

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

Author: mrcjkb