test: mark test-policy-integrity flaky on Windows

Ref: https://github.com/nodejs/node/issues/40694

PR-URL: https://github.com/nodejs/node/pull/40684
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>

test/pummel/pummel.status

@@ -7,6 +7,8 @@ prefix pummel
 [true] # This section applies to all platforms
 
 [$system==win32]
+# https://github.com/nodejs/node/issues/40694
+test-policy-integrity: PASS,FLAKY
 
 [$system==linux]
 # https://github.com/nodejs/node/issues/38226