Fix the "new" breaking of loading of plugins on Windows GitHub action…

…s. (#4426)

lib/core/pluginLoader.js

@@ -1,10 +1,12 @@
 import path from 'node:path';
 import { readdir as _readdir } from 'node:fs';
 import { promisify } from 'node:util';
+import { fileURLToPath, pathToFileURL } from 'node:url';
 
 import { importGlobalSilent } from 'import-global';
 const readdir = promisify(_readdir);
-const __dirname = path.dirname(import.meta.url);
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
 
 const defaultPlugins = new Set([
   'browsertime',
@@ -49,7 +51,7 @@ export async function parsePluginNames(options) {
     return pluginNames;
   };
 
-  const files = await readdir(new URL(pluginsDir));
+  const files = await readdir(pluginsDir);
 
   const builtins = files.map(name => path.basename(name, '.js'));
   // eslint-disable-next-line unicorn/no-array-callback-reference
@@ -60,9 +62,9 @@ export async function loadPlugins(pluginNames, options, context, queue) {
   const plugins = [];
   for (let name of pluginNames) {
     try {
-      let { default: plugin } = await import(
-        path.join(pluginsDir, name, 'index.js')
-      );
+      const pluginPath = path.join(pluginsDir, name, 'index.js');
+      const pluginUrl = pathToFileURL(pluginPath).href;
+      let { default: plugin } = await import(pluginUrl);
       let p = new plugin(options, context, queue);
       plugins.push(p);
     } catch (error_) {