Update transitive gin-tonic/gin, fixes #64

[Jacalz]

There doesn't seem to be much movement upstream on this.
Let's update our transitive dependecy in the meantime.

Fixes #64

[psanford]

I don't see much point in doing this. This is a test only dependency used by one of our dependencies. We don't link to gin at all. We are not vulnerable to CVE-2020-28483.

[Jacalz]

Indeed, we are not vulnerable to the CVE. However, as there isn’t much work happening upstream, I wanted to at least get rid of the warning.

I am also getting security warnings on GitHub because of this and I suspect that anyone else using this project probably also get those warnings. They might not know that the issue doesn’t affect us.

Either way, this was just a suggestion to fix the warning. Feel free to close it if you don't think it's worth it.

[Jacalz]

I guess I'll close this then. Feel free to reopen and merge if you have changed your mind.