chore: use with instead of assert in rollup.mjs (#2326)

Author: negezor

packages/router/rollup.config.mjs

@@ -6,7 +6,7 @@ import replace from '@rollup/plugin-replace'
 import resolve from '@rollup/plugin-node-resolve'
 import commonjs from '@rollup/plugin-commonjs'
 import chalk from 'chalk'
-import pkg from './package.json' assert { type: 'json' }
+import pkg from './package.json' with { type: 'json' }
 import terser from '@rollup/plugin-terser'
 
 const name = pkg.name