updates to be compatible with higher node version

Author: bhavy-ye

rollup.config.mjs

@@ -4,7 +4,7 @@ import babel from '@rollup/plugin-babel';
 import terser from '@rollup/plugin-terser';
 import stripLogger from 'rollup-plugin-strip-logger';
 import license from 'rollup-plugin-license';
-import pkg from './package.json' assert { type: 'json' };
+import pkg from './package.json' with { type: 'json' };
 
 const bannerTemplate = `
 Bundle of <%= pkg.name %>

rollup.dev.mjs

@@ -1,7 +1,7 @@
 import babel from '@rollup/plugin-babel';
 import commonjs from '@rollup/plugin-commonjs';
 import { nodeResolve } from '@rollup/plugin-node-resolve';
-import pkg from './package.json' assert { type: 'json' };
+import pkg from './package.json' with { type: 'json' };
 import html from 'rollup-plugin-template-html';
 import serve from 'rollup-plugin-serve';