chore: remove unused rollup plugin

This plugin is not needed anymore, since the
`@socket.io/component-emitter` package now includes an ESM version.

Author: darrachequesne

package-lock.json

@@ -65,7 +65,6 @@
     "@babel/preset-env": "^7.12.7",
     "@fails-components/webtransport": "^0.1.7",
     "@rollup/plugin-babel": "^5.3.0",
-    "@rollup/plugin-commonjs": "^21.0.0",
     "@rollup/plugin-node-resolve": "^13.0.5",
     "@sinonjs/fake-timers": "^7.1.2",
     "@types/debug": "^4.1.12",

package.json

@@ -1,5 +1,4 @@
 const { nodeResolve } = require("@rollup/plugin-node-resolve");
-const commonjs = require("@rollup/plugin-commonjs");
 const { terser } = require("rollup-plugin-terser");
 
 const version = require("../package.json").version;
@@ -22,6 +21,5 @@ module.exports = {
     nodeResolve({
       browser: true,
     }),
-    commonjs(),
   ],
 };

support/rollup.config.esm.js

@@ -1,5 +1,4 @@
 const { nodeResolve } = require("@rollup/plugin-node-resolve");
-const commonjs = require("@rollup/plugin-commonjs");
 const { babel } = require("@rollup/plugin-babel");
 const { terser } = require("rollup-plugin-terser");
 
@@ -33,7 +32,6 @@ module.exports = {
     nodeResolve({
       browser: true,
     }),
-    commonjs(),
     babel({
       babelHelpers: "bundled",
       presets: [["@babel/env"]],