[lldb][test] Disable part of TestDAP_stepInTargets.py

Flakey on our Windows on Arm bot:
https://lab.llvm.org/buildbot/#/builders/141/builds/11378

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ERROR: test_supported_capability_other_archs (TestDAP_stepInTargets.TestDAP_stepInTargets.test_supported_capability_other_archs)

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Traceback (most recent call last):

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\lldbtest.py", line 2090, in tearDown

    Base.tearDown(self)

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\lldbtest.py", line 1105, in tearDown

    hook()  # try the plain call and hope it works

    ^^^^^^

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\tools\lldb-dap\lldbdap_testcase.py", line 521, in cleanup

    self.dap_server.terminate()

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\tools\lldb-dap\dap_server.py", line 1602, in terminate

    raise DebugAdapterProcessError(process.returncode)

dap_server.DebugAdapterProcessError: lldb-dap returned non-zero exit status 1.

Config=aarch64-C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe

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See llvm#137660

Author: DavidSpickett

lldb/test/API/tools/lldb-dap/stepInTargets/TestDAP_stepInTargets.py

@@ -102,6 +102,7 @@ def test_supported_capability_x86_arch(self):
         self.continue_to_exit()
 
     @skipIf(archs=["x86", "x86_64"])
+    @skipIfWindows
     def test_supported_capability_other_archs(self):
         program = self.getBuildArtifact("a.out")
         self.build_and_launch(program)