New grin release 5.4.0 - important stability improvements

The vulnerability is already eliminated completely by upgrading to 5.4.0
which a majority of miners and exchanges have already done.
There’s no point in creating a new protocol version to fork from older Rust clients.

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For the history:
Council members approved a donation of $70K to a security researcher ( alexs-scalar (Alexs) · GitHub ) who discovered the critical vulnerability and followed responsible disclosure practices by privately reporting it to the team.

TX1: mempool - Bitcoin Explorer

TX2: mempool - Bitcoin Explorer

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