CHANGELOG: mention removal of v3.11 migration
Created by: slimsag
I intentionally didn't add a changelog entry for this, but in retrospect it could cause issues if users still haven't migrated so I am adding a changelog entry now This is for #9020
Created by: slimsag
I intentionally didn't add a changelog entry for this, but in retrospect it could cause issues if users still haven't migrated so I am adding a changelog entry now This is for #9020