fix(ethers-v6): correctly type event listener

[pocin]

fixes #867

Not sure about the broader implications of this, but when i made this change to the generated file it correctly types the last event listener arg so one can do

 contract.on( contract.filters.Swap, async ( address, fundsOwner, userSellTokenAmount, userBuyTokenAmount, event ) => { console.log(event.log.transactionHash) // this }) 

seems to be working fine in my script so far

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