build: update @rollup/plugin-alias to v6

Author: pi0

package.json

@@ -98,7 +98,7 @@
   },
  "dependencies": {
  "@cloudflare/kv-asset-handler": "^0.4.1",
- "@rollup/plugin-alias": "^5.1.1",
+ "@rollup/plugin-alias": "^6.0.0",
  "@rollup/plugin-commonjs": "^29.0.0",
  "@rollup/plugin-inject": "^5.0.5",
  "@rollup/plugin-json": "^6.1.0",