Version 0.16.0.1-1 of haskell-servant-client 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 (0.16.0.1-1 to 0.19-1): BLOCKED: Maybe temporary, maybe blocked but Britney is missing information (check below)