Remove pluginutils from dependencies

[kazuma1989]

Hi. A small fix here 👍

I've removed @rollup/pluginutils from the dependencies list because createFilter util is exposed from Vite v3. (vite >= 3 is in the peer deps, so it's safe)
Less dependencies are better.

• feat: expose createFilter util vitejs/vite#8562
• Add @rollup/pluginutils to dependencies #459

[IanVS]

Hm, this is one reason I'm not a huge fan of vite bundling all of their dependencies. If they didn't do that, package managers could de-duplicate the @rollup/pluginutils that vite uses and the @rollup/pluginutils in the dependencies here, and there'd be no impact to the size of node_modules by us depending on it directly. Instead, vite is stuck with having to re-export things and relying on other packages like this one to use what vite provides instead of using the dependencies directly.

That said, it's a decision they've made, and now to avoid extra dependencies we do need this PR. Thanks for submitting it.