Update Solana crates to 2.1

[NicolasWent]

Hello,

yellowstone-grpc-client and yellowstone-grpc-proto are not working with solana-client, solana-sdk... at version 2.1

Which ultimately leads to spl-token version 7.0 being incompatible with yellowstone-grpc

[fanatid]

Hi! This is in the plans, but first requires to finish work on #449 #465