test: mark test-fs-stat-bigint as flaky

Refs: #24593
PR-URL: #28156
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

Author: Trott

test/parallel/parallel.status

@@ -5,6 +5,8 @@ prefix parallel
 # sample-test                        : PASS,FLAKY
 
 [true] # This section applies to all platforms
+# https://github.com/nodejs/node/issues/24593
+test-fs-stat-bigint: PASS,FLAKY
 # https://github.com/nodejs/node/issues/23207
 test-net-connect-options-port: PASS,FLAKY
 # https://github.com/nodejs/node/issues/26401