[s390x] Fix Extensions.ApiDescription.Client tests on s390x

[saitama951]

Extensions.ApiDescription client tests cases were failing on s390x

Microsoft.Extensions.ApiDescription.Client.GetOpenApiReferenceMetadataTest.Execute_SetsClassName_BasedOnSanitizedOutputPath(outputPath: "aabb.cs", className: "aa__bb") [FAIL]
[xUnit.net 00:00:00.54]       Assert.Equal() Failure: Collections differ
[xUnit.net 00:00:00.54]       Expected: [["ClassName"] = "aa__bb", ["CodeGenerator"] = "NSwagCSharp", ["FirstForGenerator"] = "true", ["Namespace"] = "Console.Client", ["OriginalItemSpec"] = "TestProjects/files/NSwag.json", ···]
[xUnit.net 00:00:00.54]       Actual:   [["ClassName"] = "aa__bb", ["CodeGenerator"] = "NSwagCSharp", ["FirstForGenerator"] = "true", ["Namespace"] = "Console.Client", ["OriginalItemSpec"] = "TestProjects/files/NSwag.json", ···]
[xUnit.net 00:00:00.54]       Stack Trace:
[xUnit.net 00:00:00.54]         /home/sanjam/aspnetcore/src/Tools/Extensions.ApiDescription.Client/test/GetOpenApiReferenceMetadataTest.cs(450,0): at Microsoft.Extensions.ApiDescription.Client.GetOpenApiReferenceMetadataTest.Execute_SetsClassName_BasedOnSanitizedOutputPath(String outputPath, String className)
[xUnit.net 00:00:00.54]            at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
[xUnit.net 00:00:00.54]            at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
[xUnit.net 00:00:00.54]    

according to the msdocs

For purposes of enumeration, each item in the dictionary is treated as a [KeyValuePair<TKey,TValue>](https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.keyvaluepair-2?view=net-8.0) structure representing a value and its key. The order in which the items are returned is undefined.

This is just a snippet of a particular failure, I have attached the other failures as well
Untitled.txt