test: skip test-http-pipeline-flood on IBM i

PR-URL: nodejs#48048
Refs: nodejs#48047
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: abmusse

test/parallel/parallel.status

@@ -92,6 +92,8 @@ test-http-server-unconsume: PASS, FLAKY
 test-http-upgrade-advertise: PASS, FLAKY
 test-tls-client-mindhsize: PASS, FLAKY
 test-tls-write-error: PASS, FLAKY
+# https://github.com/nodejs/node/issues/48047
+test-http-pipeline-flood: SKIP
 
 [$asan==on]
 # https://github.com/nodejs/node/issues/39655