Update subsets.md

[pantousage]

manic update

[greptile-apps]

Greptile Summary

Adds Manic EMU 2.0.0+ to Multiset requirements.

Confidence Score: 5/5

Safe to merge.

The documentation addition creates no established issue.

_{Reviews (1): Last reviewed commit: "Update subsets.md" | Re-trigger Greptile}