multi: update to fn v2

[ProofOfKeags]

Change Description

This pulls in the changes for fn v2

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[Roasbeef]

Linter failure:

func (s *StateMachine[Event, Env]) executeDaemonEvent(
Error: lnwallet/channel.go:3014:5: return with no blank line before (nlreturn)
				return isAdd && !shouldSkip
				^

[starius]

LGTM! 🏆
One proposal about error variable.

[guggero]

LGTM 🎉