rollup-plugin-windicss: bump peer dependency to rollup 3

[milahu]

the plugin works with rolllup 3, see for example https://github.com/milahu/solidjs-rollup-web-extension-starter

vite-plugin-windicss/packages/rollup-plugin-windicss/package.json

Lines 38 to 40 in d5ad27b

	"peerDependencies": {
	"rollup": "^2.0.0"
	},