test: mark stringbytes-external-max flaky on AIX

Signed-off-by: Stewart X Addison <[email protected]>
PR-URL: #60995
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>

Author: sxa

test/addons/addons.status

@@ -23,6 +23,7 @@ register-signal-handler/test: PASS,FLAKY
 
 [$system==aix]
 # https://github.com/nodejs/node/issues/60494
+stringbytes-external-exceed-max/test-stringbytes-external-at-max: PASS,FLAKY
 stringbytes-external-exceed-max/test-stringbytes-external-exceed-max: PASS,FLAKY
 stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-1-hex: PASS,FLAKY
 stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-1-utf8: PASS,FLAKY