flake.lock: Update (#1859)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/7b803c35192b8c8b186b2a6f610b7227df0b141e?narHash=sha256-1zkQqNo6fSJmUsxmHO1PmwEXVesycS7bGTT60BAdm6U%3D' (2025-06-14)
  → 'github:nixos/nixpkgs/e090b4f42a1590342b3e9babcef9c6717fd894ac?narHash=sha256-qbK5VTntEn3nT%2BaTLy%2B%2BrsNXFa9XiuKNW5j8Ufnna64%3D' (2025-06-21)

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Author: github-actions[bot]