[Test] Disable custom_rr_abi test until we can fix it. (#62304)

Author: mikeash

test/Runtime/custom_rr_abi.swift

@@ -6,6 +6,8 @@
 // UNSUPPORTED: use_os_stdlib
 // UNSUPPORTED: back_deployment_runtime
 
+// REQUIRES: rdar102783074
+
 import StdlibUnittest
 
 // A class that can provider a retainable pointer and determine whether it's