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I was running an older version of sendy but I just updated to 184.108.40.206 since I've got the email from Amazon regarding the end of support for Signature V3.
Do I need to do anything else, perhaps in the AWS console, or will all future campaigns be using Signature V4 from now on?
You'd only need to update to the latest version. There's no need to do anything else.
For more information, please see → https://sendy.co/forum/discussion/14863/amazon-ses-ends-support-for-039signature-v3039-update-sendy-to-the-latest-version#Item_1