chore(deps): update nix flake inputs

[github-actions]

Summary

• Automated update of Nix flake inputs

Test plan

• nix flake check passes in CI

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🤖 This PR was automatically created by the scheduled Nix flake update workflow.

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Summary by cubic

Refreshes Nix flake inputs in flake.lock to the latest upstream. Keeps nixpkgs and dev tools current for reproducible builds and CI.

• Dependencies
  • Bumped: flake-parts, git-hooks.nix, nixpkgs, nixpkgs.lib, treefmt-nix

^{Written for commit 8b1d032. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Auto-approved: Automated Nix flake lockfile update. These are routine maintenance changes typically validated by CI.}