Update Go version

[iwodder]

Hi @emilybache ,

I was working through the Go variant of the kata and noticed it hadn't been updated in sometime. I was wondering if you'd be open to letting me update it?

I was thinking about making the following changes:

1. Update Go to version 1.22, so people could take advantage of generics and other language updates.
2. Replace the custom verify method used in the approval test to instead leverage approvals/go-approval-test. Essentially, it's just following up on the conversation you had with the original author of the Go variant.

Let me know what you think.

Also, thanks for taking the time to put this together. I did the kata while following along with the book and found it interesting.

[emilybache]

Those sound like very sensible updates, thanks for suggesting them. Would you like to send me a pull request?

[iwodder]

Of course, I went ahead and submitted a PR a few minutes ago.

[emilybache]

Thanks!