Update Nix flake inputs

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Automated changes by the update-flake-lock GitHub Action.

Flake lock file updates:

• Updated input 'fenix':
    'https://api.flakehub.com/f/pinned/nix-community/fenix/0.1.2375%2Brev-113eba389317407992ea219d5aaced44bf6407f9/0199045f-8452-723d-b201-deb22d41c75e/source.tar.gz?narHash=sha256-xv2u5dnQpdWkrIy5TBSomr055odWtRSoECSGBzNpp3w%3D' (2025-09-01)
  → 'https://api.flakehub.com/f/pinned/nix-community/fenix/0.1.2408%2Brev-0956bc5d1df2ea800010172c6bc4470d9a22cb81/01999edc-854f-7714-9439-7c9ee1181398/source.tar.gz?narHash=sha256-hmiTEoVAqLnn80UkreCNunnRKPucKvcg5T4/CELEtbw%3D' (2025-10-01)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/21614ed2d3279a9aa1f15c88d293e65a98991b30?narHash=sha256-wfaKRKsEVQDB7pQtAt04vRgFphkVscGRpSx3wG1l50E%3D' (2025-08-30)
  → 'github:rust-lang/rust-analyzer/a6bc4a4bbe6a65b71cbf76a0cf528c47a8d9f97f?narHash=sha256-H4Hx/EuMJ9qi1WzPV4UG2bbZiDCdREtrtDvYcHr0kmk%3D' (2025-09-30)
• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.861038%2Brev-c23193b943c6c689d70ee98ce3128239ed9e32d1/01994596-722e-716c-b0eb-e6b07d4de75b/source.tar.gz?narHash=sha256-hLEO2TPj55KcUFUU1vgtHE9UEIOjRcH/4QbmfHNF820%3D' (2025-09-13)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.886100%2Brev-08dacfca559e1d7da38f3cf05f1f45ee9bfd213c/019a329e-32b1-7e68-9599-4784bdd5f623/source.tar.gz?narHash=sha256-o9KF3DJL7g7iYMZq9SWgfS1BFlNbsm6xplRjVlOCkXI%3D' (2025-10-28)

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