Update Solana to a more recent version #565
Description
At the moment we use the Solana 1.7.8 SDK, because Anchor the eDSL demands this version, and the Serum multisig program uses Anchor. It would be good to update to a more recent version, especially so we can drop our patches from the [patch.crates-io] section in Cargo.toml, as those changes have been merged upstream.