Deprecate zip package and use github.com/rymdport/archive/zip instead

[Jacalz]

Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

The zip code was extricated, together with some other archive handling, into the Go package github.com/rymdport/archive. Instead of maintaining two copies, we should deprecate the code here and try to use that one instead.

Describe the solution you'd like to see.

Use the other package and deprecate the zip package in this module.

[Jacalz]

No uses of the package according to pkg.go.dev. Has been removed in #172.

[Jacalz]

We need to start using the other package as well of course.

[Jacalz]

We might wish to use https://pkg.go.dev/github.com/mholt/archives instead and stop maintaining our own package.