chore: update flake.lock

[spacebear21]

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

Flake lock file updates:

• Updated input 'crane':
    'github:ipetkov/crane/ad8b31a' (2026-04-26)
  → 'github:ipetkov/crane/d459c13' (2026-05-03)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/a4bf066' (2026-04-25)
  → 'github:NixOS/nixpkgs/26ef669' (2026-05-01)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/a6cb222' (2026-04-27)
  → 'github:oxalica/rust-overlay/669151b' (2026-05-04)
• Updated input 'uv2nix':
    'github:pyproject-nix/uv2nix/60982c3' (2026-04-20)
  → 'github:pyproject-nix/uv2nix/5ad90d4' (2026-05-04)

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[coveralls]

Coverage Report for CI Build 25319110269

Coverage remained the same at 85.006%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

---

Coverage Stats

Relevant Lines:	13452
Covered Lines:	11435
Line Coverage:	85.01%
Coverage Strength:	398.4 hits per line

---

💛 - Coveralls

[nothingmuch]

see #1521, lint fixes merged in unrelated PR #1509