Security txt

[kharlanchuk47]

Please add the "cpi" feature to the exceptions for the solana_security_txt macro.
lib:rs line 33

#[cfg(not(feature = "no-entrypoint"))]
solana_security_txt::security_txt! {
    name: "Message Transmitter for CCTP",
    project_url: "https://github.com/circlefin/solana-cctp-contracts",
    contacts: "link:https://hackerone.com/circle",
    policy: "https://github.com/circlefin/solana-cctp-contracts/blob/master/SECURITY.md"
}