Fix Http Results test to respond to dotnet/runtime#87093

Author: eerhardt

src/Http/Http.Results/test/ResultsTests.cs

@@ -1009,15 +1009,15 @@ public void Json_WithNullSerializerContext_ThrowsArgException()
     [Fact]
     public void Json_WithInvalidSerializerContext_ThrowsInvalidOperationException()
     {
-        var ex = Assert.Throws<InvalidOperationException>(() => Results.Json(null, type: typeof(object), context: StringJsonContext.Default));
-        Assert.Equal(ex.Message, $"Unable to obtain the JsonTypeInfo for type 'System.Object' from the context '{typeof(StringJsonContext).FullName}'.");
+        var ex = Assert.Throws<InvalidOperationException>(() => Results.Json(null, type: typeof(Todo), context: StringJsonContext.Default));
+        Assert.Equal(ex.Message, $"Unable to obtain the JsonTypeInfo for type 'Microsoft.AspNetCore.Http.HttpResults.ResultsTests+Todo' from the context '{typeof(StringJsonContext).FullName}'.");
     }
 
     [Fact]
     public void JsonOfT_WithInvalidSerializerContext_ThrowsInvalidOperationException()
     {
-        var ex = Assert.Throws<InvalidOperationException>(() => Results.Json<object>(null, context: StringJsonContext.Default));
-        Assert.Equal(ex.Message, $"Unable to obtain the JsonTypeInfo for type 'System.Object' from the context '{typeof(StringJsonContext).FullName}'.");
+        var ex = Assert.Throws<InvalidOperationException>(() => Results.Json<Todo>(null, context: StringJsonContext.Default));
+        Assert.Equal(ex.Message, $"Unable to obtain the JsonTypeInfo for type 'Microsoft.AspNetCore.Http.HttpResults.ResultsTests+Todo' from the context '{typeof(StringJsonContext).FullName}'.");
     }
 
     [Fact]