chore: Maintenance (Deno 2, update oxc, use oxc-minifier)

[beeequeue]

I saw some stuff that could use some maintenance so I decided to do it for fun!

The diff without the lockfile is +49 -65

• Upgraded to Deno 2
• Upgraded oxc-transform to latest version
  • I checked the build output, and the only difference is that doc comments are retained now
  • Also added node16 as an explicit target, the minimum version in engines.node
• Replaced terser with oxc-minify
  • It's technically experimental, but so is oxc-transform :p
  • I checked the minified sizes and they're the same and even 4 bytes smaller in walk.mjs
• Removed pkg-up from benchmark
  • Its new name package-up is already in the benchmark

[lukeed]

Thanks! I did the Deno 2.2 upgrade myself so that the diff was simpler here. And I reverted some unwanted changes/scripts, effectively keeping the oxc-* updates. 🙇