flake.lock: Update

Flake lock file updates:

• Updated input 'gepetto':
    'github:gepetto/nix/758268e' (2025-11-30)
  → 'github:gepetto/nix/35d2fb3' (2025-12-29)
• Updated input 'gepetto/flake-parts':
    'github:hercules-ci/flake-parts/2cccadc' (2025-11-21)
  → 'github:hercules-ci/flake-parts/a34fae9' (2025-12-15)
• Updated input 'gepetto/flake-parts/nixpkgs-lib':
    'github:nix-community/nixpkgs.lib/719359f' (2025-10-29)
  → 'github:nix-community/nixpkgs.lib/2075416' (2025-12-14)
• Updated input 'gepetto/nix-ros-overlay':
    'github:lopsided98/nix-ros-overlay/a63afe3' (2025-11-29)
  → 'github:lopsided98/nix-ros-overlay/6c9921c' (2025-12-22)
• Updated input 'gepetto/src-agimus-controller':
    'github:agimus-project/agimus_controller/94c6fda' (2025-11-10)
  → 'github:agimus-project/agimus_controller/5ef41cd' (2025-12-17)
• Updated input 'gepetto/src-agimus-msgs':
    'github:agimus-project/agimus_msgs/2861569' (2025-11-24)
  → 'github:agimus-project/agimus_msgs/c9cfe53' (2025-12-09)
• Updated input 'gepetto/src-franka-description':
    'github:agimus-project/franka_description/3ae2451' (2025-11-28)
  → 'github:agimus-project/franka_description/2bdc8da' (2025-12-17)
• Updated input 'gepetto/system-manager':
    'github:numtide/system-manager/a0343ab' (2025-11-27)
  → 'github:numtide/system-manager/bd3e419' (2025-12-17)
• Updated input 'gepetto/treefmt-nix':
    'github:numtide/treefmt-nix/5b4ee75' (2025-11-12)
  → 'github:numtide/treefmt-nix/42d96e7' (2025-12-17)

Author: github-actions[bot]