test: set test-runner-watch-mode-complex as flaky

PR-URL: #54802
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matthew Aitken <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>

Author: anonrig

test/parallel/parallel.status

@@ -27,6 +27,8 @@ test-error-serdes: PASS, FLAKY
 test-snapshot-incompatible: SKIP
 
 [$system==win32]
+# https://github.com/nodejs/node/issues/54807
+test-runner-watch-mode-complex: PASS, FLAKY
 
 # Windows on x86
 [$system==win32 && $arch==ia32]