[lldb][test] TestCppTemplateArguments.py: skip on older compilers

This test needs to be compiled with compilers that support floating point NTTP.

Author: Michael137

Diff for: lldb/test/API/lang/cpp/template-arguments/TestCppTemplateArguments.py

@@ -6,6 +6,7 @@
 
 class TestCase(TestBase):
     @no_debug_info_test
+    @skipIf(compiler="clang", compiler_version=["<", "20.0"])
     def test(self):
         self.build()
         target = self.dbg.CreateTarget(self.getBuildArtifact("a.out"))