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Bastian Köcher authored
Remove the `GRANDPA_AUTHORITIES_KEY` key and its usage. Apparently this was used in the early days to communicate the grandpa authorities to the node. However, we have now a runtime api that does this for us. So, this pull request is moving from the custom managed storage item to a FRAME managed storage item. This pr also includes a migration for doing the switch on a running chain. --------- Co-authored-by: Davide Galassi <[email protected]>