Fix MapAction_SingleTimeOnlyParam_StringReturn (#47064)

This test assumes a locale and fails in the Helix queue on other distros.

Author: eerhardt

src/Http/Http.Extensions/test/RequestDelegateGenerator/RequestDelegateGeneratorTests.cs

@@ -106,7 +106,7 @@ public async Task MapAction_ExplicitQueryParam_StringReturn(string source, strin
     public async Task MapAction_SingleTimeOnlyParam_StringReturn()
     {
         var (results, compilation) = await RunGeneratorAsync("""
-app.MapGet("/hello", ([FromQuery]TimeOnly p) => p.ToString());
+app.MapGet("/hello", ([FromQuery]TimeOnly p) => p.ToString("o"));
 """);
         var endpoint = GetEndpointFromCompilation(compilation);
 
@@ -123,7 +123,7 @@ public async Task MapAction_SingleTimeOnlyParam_StringReturn()
         httpContext.Request.QueryString = new QueryString("?p=13:30");
 
         await endpoint.RequestDelegate(httpContext);
-        await VerifyResponseBodyAsync(httpContext, "1:30 PM");
+        await VerifyResponseBodyAsync(httpContext, "13:30:00.0000000");
         await VerifyAgainstBaselineUsingFile(compilation);
     }