Version 0.16-2 of haskell-servant-client-core is marked for autoremoval from testing on Wed 31 Aug 2022. It depends (transitively) on haskell-free, haskell-vault, affected by #1015281, #1015807. You should try to prevent the removal by fixing these RC bugs.
Migration status for haskell-servant-client-core (0.16-2 to 0.19-1): BLOCKED: Cannot migrate due to another item, which is blocked (please check which dependencies are stuck)