Require validator ver 1.3 for link without version

Require a lesser validator version for linking without version for
RunLinkWithTempReg test in order to allow the test to run on older
validators. 1.3 is the lowest version that supports libraries

Another follow up to microsoft#5378

tools/clang/unittests/HLSL/LinkerTest.cpp

@@ -935,7 +935,7 @@ TEST_F(LinkerTest, RunLinkWithTempReg) {
   AssembleLib(L"..\\HLSLFileCheck\\dxil\\linker\\TempReg.ll", &pTempRegLib);
   CComPtr<IDxcBlob> pEntryLib;
   CompileLib(L"..\\HLSLFileCheck\\dxil\\linker\\use-TempReg.hlsl", &pEntryLib,
-             {L"-validator-version", L"1.7"}, L"lib_6_3");
+             {L"-validator-version", L"1.3"}, L"lib_6_3");
   CComPtr<IDxcLinker> pLinker;
   CreateLinker(&pLinker);
   LPCWSTR libName = L"entry";