nodejs: require big-parallel system feature

This helps schedule it onto a bigger build slot on hydra.

pkgs/development/web/nodejs/nodejs.nix

@@ -683,6 +683,9 @@ let
         done
       '';
 
+      # reduces build time from ~90 to ~15 minutes on hydra
+      requiredSystemFeatures = [ "big-parallel" ];
+
       passthru.tests = {
         version = testers.testVersion {
           package = self;