chore: nix flake update

[systemstart]

Automated weekly nix flake update.

Bumps nixpkgs (nixos-unstable) and microvm to their latest
available revisions. CI will build all four flavors against the
updated lock file.

[coderabbitai]

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Review skipped

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⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

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Review profile: CHILL

Plan: Pro Plus

Run ID: 3b3492a9-2160-4e31-bd9a-7a5b6035a212

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update_flake_lock_action

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