feat: support detecting ESM libraries (#11440)

rel: https://nodejs.org/api/packages.html#packages_exports

lib/manager/npm/extract/type.ts

@@ -6,7 +6,7 @@ export function mightBeABrowserLibrary(packageJson: NpmPackage): boolean {
     // it's not published
     return false;
   }
-  if (packageJson.main === undefined) {
+  if (packageJson.main === undefined && packageJson.exports === undefined) {
     // it can't be required
     return false;
   }