chore: import assertions are no longer supported by Node

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

rollup.config.mjs

@@ -6,7 +6,7 @@ import { nodeResolve } from '@rollup/plugin-node-resolve'
 import commonjs from '@rollup/plugin-commonjs'
 import typescript from '@rollup/plugin-typescript'
 
-import packageJSON from './package.json' assert { type: 'json' }
+import packageJSON from './package.json' with { type: 'json' }
 
 const external = [
 	...Object.keys(packageJSON.dependencies),