chore: update flake.lock

[github-actions]

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

Flake lock file updates:

• Updated input 'flake-schemas':
    'https://api.flakehub.com/f/pinned/DeterminateSystems/flake-schemas/0.4.2/019d5cf2-ee3c-7313-964e-f3f83c35d509/source.tar.gz' (2026-04-03)
  → 'https://api.flakehub.com/f/pinned/DeterminateSystems/flake-schemas/0.5.0/019e83cf-9af3-78b1-ac5b-70e68ad1efe1/source.tar.gz' (2026-06-01)
• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2511.911667%2Brev-a4bf06618f0b5ee50f14ed8f0da77d34ecc19160/019dcae8-75b0-71d1-abd5-feab9658f0fa/source.tar.gz' (2026-04-25)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2605.1013883%2Brev-21a67dc470149f337cecafbe965d8d252a390518/01a0941f-eef0-70e0-93ac-63af13618393/source.tar.gz' (2026-09-11)

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Auto-approved: This PR updates only the flake.lock file for the nixpkgs input, which is a routine and low-risk dependency lock update with no changes to source code or business logic.}