Correct type of replacementBlockhash in simulateTransaction

[mcintyre94]

In my testing the replacementBlockhash field is returned as a blockhash lifetime, not just a blockhash:

            "replacementBlockhash": {
                "blockhash": "8cKUmRzjcBaDFnuvQT69FMQt6LQMessU57d4c6YsuUS8",
                "lastValidBlockHeight": 276255611
            },

This also matches the server code: https://github.com/anza-xyz/agave/blob/aad0381e10e3c4a6507d9aa2e57588e6dc6fc995/rpc/src/rpc.rs#L3817

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[lorisleiva]

Good catch. 👌

[steveluscher]

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