chore(deps): update cachix/install-nix-action digest to 8aa0397

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cachix/install-nix-action (changelog)	action	digest	ab73962 → 8aa0397

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[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-05-05 02:27 UTC · Rule: bot-updates
• ✅ Checks passed · on draft merge queue: embarking main (abdd331) and #1952 together #1953
• ✅ Merged — 2026-05-05 02:35 UTC · at 0564790c1a0a8dbacb1166ba11665ba982be3628 · rebase

This pull request spent 7 minutes 55 seconds in the queue, including 3 minutes 54 seconds running CI.

Required conditions to merge

• all of:
  • check-success=buildbot/nix-build
  • check-success=buildbot/nix-effects
  • check-success=buildbot/nix-eval