fix: update actor code ID in lotus-shed invariant check

[rjan90]

Related Issues

When running the invariant check after running a bench migration (./lotus-shed migrate-state --check-invariants=true ..) it failed with:

main.checkNv24Invariants
     /home/filoz/lotus/cmd/lotus-shed/migrations.go:649
  - unexpected actor code CID bafk2bzaceabq3zagn4ee2wbagarxf7xgbrqgqgm55xydanxik2bifztqgynts for address t094151:

This is because the checkNv24Invariants was wrongly set to Version 14 actors.

Proposed Changes

This PR updates actors.GetActorCodeIDs to Version 15 in the checkNv24Invariants function.

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title conforms with contribution conventions
• Update CHANGELOG.md or signal that this change does not need it per contribution conventions
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green