when 1.16 is out upgrade and use stack height to detect cpi level

[austbot]

see https://github.com/solana-labs/solana/blob/master/transaction-status/src/lib.rs#L225

usage of stack height should change some of this code
https://github.com/metaplex-foundation/blockbuster/blob/main/blockbuster/src/instruction.rs#L61

in short we are relying on 0 self cpis happening to determine the depth of the cpi, this is only because via geyser we dont get that information.

see also metaplex-foundation/digital-asset-rpc-infrastructure#107