fix(types/mempool): fix slice init length (backport #21494)

[mergify]

Description

fix slice init length

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Summary by CodeRabbit

• Performance Improvements
  • Enhanced memory efficiency in the signer data handling process, allowing for dynamic growth of the data structure based on actual needs.

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This is an automatic backport of pull request #21494 done by [Mergify](https://mergify.com).

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[julienrbrt]

Let's add a changelog here saying GetSigners was returning empty signers of len(sigs) and the the signers.

I'll do it once I'm no more AFK tonight a