update go from 1.18 to 1.20.2

What is your Merge about?

If this is your first merge, please use the Initialization Template.

For more information please visit Iron Bank Documentation

Note: Please be sure you an issue related to this merge request and the issue is labeled ~"Hardening::Review", this will initiate a CHT member review your merge request.

Update Go from EOL 1.18 to 1.20 (confirmed supported by Jaeger)