flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs-unstable':
    'github:nixos/nixpkgs/2c8d3f48d33929642c1c12cd243df4cc7d2ce434?narHash=sha256-F7n4%2BKOIfWrwoQjXrL2wD9RhFYLs2/GGe/MQY1sSdlE%3D' (2025-04-02)
  → 'github:nixos/nixpkgs/7fd36ee82c0275fb545775cc5e4d30542899511d?narHash=sha256-9h7%2B4/53cSfQ/uA3pSvCaBepmZaz/dLlLVJnbQ%2BSJjk%3D' (2025-07-25)
• Updated input 'search':
    'github:NuschtOS/search/56a49ffef2908dad1e9a8adef1f18802bc760962?narHash=sha256-LdXtHFvhEC3S64dphap1pkkzwjErbW65eH1VRerCUT0%3D' (2025-04-03)
  → 'github:NuschtOS/search/40987cc1a24feba378438d691f87c52819f7bd75?narHash=sha256-Pmpke0JtLRzgdlwDC5a%2BaiLVZ11JPUO5Bcqkj0nHE/k%3D' (2025-07-25)
• Updated input 'search/ixx':
    'github:NuschtOS/ixx/9fd01aad037f345350eab2cd45e1946cc66da4eb?narHash=sha256-EiOq8jF4Z/zQe0QYVc3%2BqSKxRK//CFHMB84aYrYGwEs%3D' (2024-10-26)
  → 'github:NuschtOS/ixx/cc5f390f7caf265461d4aab37e98d2292ebbdb85?narHash=sha256-FVO01jdmUNArzBS7NmaktLdGA5qA3lUMJ4B7a05Iynw%3D' (2025-05-26)
• Updated input 'secshell':
    'github:secshellnet/nixos/8aaecff9d94ef4bfdb6c78617fbcae15fe84127b?narHash=sha256-NRKrNdHG%2B2P64vGHUUQzwuBELSgoi7HdDkg1CoQVB1E%3D' (2025-04-04)
  → 'github:secshellnet/nixos/be9173057a6c3324dc0782437a5ef983c324212b?narHash=sha256-8DFw/WL12MvLU7A87mxAX5CqpwEaK583LJ1B1uO6jBU%3D' (2025-07-26)

Author: felbinger