Anton 1453bc9a2d [frame/im-online] remove ensure from pre_upgrade (#14401)
* [frame/im-online] remove ensure from pre_upgrade

modify ensure in post_upgrade to allow for future upgrades
refs https://github.com/paritytech/substrate/pull/14251#discussion_r1230973672

* cargo fmt
2023-06-16 12:17:01 +00:00
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