test: mark tests as slow on Rasberry PIs

Refs: #42379

A number of tests have been failing internmittently
on the Rasberry PIs with timeouts since the update
to OpenSSL 3.0. Mark them as SLOW to see if that
removes the flakiness.

Signed-off-by: Michael Dawson <mdawson@devrus.com>

test/parallel/parallel.status

@@ -22,6 +22,13 @@ test-domain-error-types: PASS,FLAKY
 
 [$system==macos]
 
+[$arch==arm]
+test-crypto-dh-odd-kea: SLOW
+test-crypto-binary-default: SLOW
+test-crypto-dh: SLOW
+test-crypto-dh-constructor: SLOW
+test-crypto-dh-leak: SLOW
+
 [$arch==arm || $arch==arm64]
 # https://github.com/nodejs/node/pull/31178
 test-crypto-dh-stateless: SKIP