Release v3.17.3 (#14)

* Prepare release v3.17.3

* flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/f20dc5d' (2026-03-01)
  → 'github:hercules-ci/flake-parts/3107b77' (2026-04-01)
• Updated input 'nix':
    'https://api.flakehub.com/f/pinned/DeterminateSystems/nix-src/3.17.2/019d3110-f384-7933-a525-8f854039828f/source.tar.gz' (2026-03-27)
  → 'https://api.flakehub.com/f/pinned/DeterminateSystems/nix-src/3.17.3/019d6913-e8c2-7128-ba76-3dc4f6b58158/source.tar.gz' (2026-04-07)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/71b125c' (2026-03-12)
  → 'github:numtide/treefmt-nix/7592596' (2026-04-02)

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Author: github-actions[bot]