flake.lock: Update

Flake lock file updates:

• Updated input 'merlin5_3':
    'github:ocaml/merlin/8b88b89ee7431a23eaf95e4e02e45dc65595aa74?narHash=sha256-3Cb78vSGjZLhSLJSMy2ig8AmrRf/9wt5o%2Bb00rEi8uM%3D' (2025-06-24)
  → 'github:ocaml/merlin/59f2b8dae99435c386ac0451ee91a353d8057728?narHash=sha256-XaH%2BfFLKZtH0v0f319Bj4UfGkv7CtpEZudUQyA/kdwc%3D' (2025-11-07)
• Updated input 'nixpkgs':
    'github:nix-ocaml/nix-overlays/b5bfc70fe1cc5ebde734c9c2fa6e14b4a34f2d5f?narHash=sha256-qAL4G5z/fVCynZ5iNp8J26QV3sqGwZ9yM2igkkHDdrE%3D' (2025-08-10)
  → 'github:nix-ocaml/nix-overlays/ab27cbf225d8a791f383598c012e9e6890247209?narHash=sha256-WiBUA/6E/bwflafHBHBngG45k/oinpask252UqZXKEM%3D' (2025-11-08)
• Updated input 'nixpkgs/nixpkgs':
    'github:NixOS/nixpkgs/641d909c4a7538f1539da9240dedb1755c907e40?narHash=sha256-HfVZCXic9XLBgybP0318ym3cDnGwBs/%2BH5MgxFVYF4I%3D' (2025-08-10)
  → 'github:NixOS/nixpkgs/8ea611305a7db12c49446f9c40c609614419ec4b?narHash=sha256-vLjEPWbntbVNKIDbQW7fUj6y3bkIJaSCuy6sJ2cXeNI%3D' (2025-11-08)

Author: github-actions[bot]