chore: prepare release 0.23.6

[github-actions]

This PR was created automatically. Merging it will create a new release for 0.23.6

Fixes

• reject nonunique txid txes from mempool
• Use max of chain height and price table height when storing sectors.

[claude]

Claude Code Review

Claude Code Review is paused for this repository. To reconnect it, an admin of this repository's GitHub organization (or the account owner, for personal repositories) who can also manage your Claude organization's Code Review settings needs to re-link GitHub in Code Review settings. This is a one-time step.

_{Tip: disable this comment in your organization's Code Review settings.}