I'm struggling to think of a scenario where bumping the minimum Go version you support would be essential to fixing a bug though, because that would imply a massive Golang bug and AFAIK it's pretty stable.

And if it was a massive Golang bug, then maybe everyone needs to upgrade anyway.

Or not a Golang bug at all but rather a new Golang feature that the developer chose to use rather than trying to be backward compatible with some older Golang versions.