runtime: skip flaky TestWindowsStackMemoryCgo

Updates #22575

Change-Id: I1f848768934b7024d2ef01db13b9003e9ca608a0
Reviewed-on: https://go-review.googlesource.com/76030Reviewed-by: Russ Cox <rsc@golang.org>

src/runtime/crash_cgo_test.go

@@ -468,5 +468,6 @@ func TestWindowsStackMemoryCgo(t *testing.T) {
 	if runtime.GOOS != "windows" {
 		t.Skip("skipping windows specific test")
 	}
+	testenv.SkipFlaky(t, 22575)
 	testWindowsStackMemory(t, runTestProg(t, "testprogcgo", "StackMemory"))
 }