Amplify Studio/Backend created them I believe?
Yes, The following Amplify official documentation describes them. 
 Basics - Manage team access - AWS Amplify Docs
Is there a CLI command or button I can push on the console that will update the lambda runtime for me?
At this time, there does not appear to be a way to automatically update the runtime, but the AWS team is already aware of this issue, as noted in the following GitHub Issue. 
 Amplify studio still generating deprecated Node.js 12.x runtime Lambda functions - Issue #639 - aws-amplify/amplify-adminui
The following question also has a similar answer, and it seems the best approach is to wait for an update to the Amplify CLI. 
 Amplify auto-generated lambda functions using Node 12 | AWS re:Post
For now, we recommend checking GitHub regularly.
We hope this will be helpful.
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