1.12 is now EOL for almost 2 years: https://endoflife.date/go.

As a reference, supported Ubuntu versions use either 1.10 or 1.13:
https://packages.ubuntu.com/search?keywords=golang-go

So I think this bump is reasonable.

This is done to get access to stdlib methods like errors.Is and
formatting statement %w, which is de facto standard for handling errors
nowadays.