test: skip crypto test on arm buildbots

The Raspberry Pis are too slow to run this computationally expensive
test in a timely manner, it times out after 240 seconds.

PR-URL: #32636
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>

test/known_issues/known_issues.status

@@ -27,3 +27,6 @@ test-vm-timeout-escape-promise: PASS,FLAKY
 [$system==aix]
 
 [$arch==arm]
+# The Raspberry Pis are too slow to run this test.
+# See https://github.com/nodejs/build/issues/2227#issuecomment-608334574
+test-crypto-authenticated-stream: SKIP