[lldb][test] Disable a test from TestDAP_cancel.py on Windows

Flakey on our Windows on Arm bot:
https://lab.llvm.org/buildbot/#/builders/141/builds/11516

See #137660

Author: DavidSpickett

lldb/test/API/tools/lldb-dap/cancel/TestDAP_cancel.py

@@ -70,6 +70,7 @@ def test_pending_request(self):
         self.assertEqual(cancel_resp["success"], True)
         self.continue_to_exit()
 
+    @skipIfWindows # https://github.com/llvm/llvm-project/issues/137660
     def test_inflight_request(self):
         """
         Tests cancelling an inflight request.