v.0.9.42 upgrade: #1590
As per: (https://forum.polkadot.network/t/polkadot-release-analysis-v0-9-41-v0-9-42/2828/1) and (paritytech/substrate#12951)
After introducing a runtime with this change in it, chains should ensure that all accounts are upgraded by repeatedly calling upgrade_accounts giving it account IDs which are not yet upgraded. A script which does this shall be provided.
The goal of this issue is to make sure accounts get upgraded.