chore: upgrade: Update codename for NV23

[rjan90]

Proposed Changes

This PR updates the codename for NetworkVersion23 to reflect that Waffle has been choosen for the codename of NV23: https://metropolis.vote/dashboard/c/6pnapz4axv.

Slack-thread asking for clarification here: https://filecoinproject.slack.com/archives/CEHTVSEG6/p1718632500744349?thread_ts=1717005618.376869&cid=CEHTVSEG6

Checklist

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• PR title is in the form of of <PR type>: <area>: <change being made>
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