update go-gh to latest version

[mntlty]

What are you trying to accomplish?

Closes #59

updates github.com/cli/go-gh to v1.2.1 which resolves Error: authentication token not found for host [github.com](https://github.com/)" for users who have their GitHub token stored securely

What approach did you choose and why?

Following the instructions in the linked issue, update the go-gh dependency.

Tested locally:

$ go build .
$ gh ext install . 
$  gh actions-cache list          
Total caches size 183.37 MB

Showing 14 of 14 cache entries in actions/gh-actions-cache
...

Anything you want to highlight for special attention from reviewers?