refactor: bye golang.org/x/exp

[kzys]

After Go 1.23, the standard library provides what we use from the exp package.

Change Summary

What and Why:

How:

Related to:

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Documentation

• [ ] Fresh Produce
• [ ] In superfly/docs, or asked for help from docs team
• [x] n/a

[kzys]

Hmm, I need to upgrade golangci-lint first :(