Test: Temporarily disable implicit_weak_capture.swift for back_deployment_runtime configs.

Author: tshortli

test/expr/closure/implicit_weak_capture.swift

@@ -1,9 +1,11 @@
 // RUN: %target-run-simple-swift(-Xfrontend -disable-availability-checking)
 
 // REQUIRES: concurrency
-
 // REQUIRES: executable_test
 
+// rdar://102155748
+// UNSUPPORTED: back_deployment_runtime
+
 func runIn10ms(_ closure: @escaping @Sendable () -> Void) {
   Task {
     try! await Task.sleep(nanoseconds: 10_000_000)