fix: immut over mut ref on validate #863
Merged
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Closes: #864
Description
The core validate handler uses mutable reference, even though, the mutable reference is not needed.
https://github.com/cosmos/ibc-rs/blob/133863db5f9ce56d57b2502913a21bde0fad7bda/crates/ibc/src/core/handler.rs#L54-L58
This PR updates it to immutable reference.
https://github.com/cosmos/ibc-rs/blob/99ca41047f8f7ddfd16c955fc340ebf969a641d4/crates/ibc/src/core/handler.rs#L54-L58
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