benchmark: fix misc/startup failure

PR-URL: nodejs/node#42746
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>

benchmark/fixtures/require-cachable.js

@@ -6,5 +6,5 @@ const {
 } = internalBinding('native_module');
 
 for (const key of canBeRequired) {
-  require(key);
+  require(`node:${key}`);
 }