Clean up tests

Author: MaggieKimani1

test/Microsoft.OpenApi.Readers.Tests/V3Tests/Samples/OpenApiDocument/documentWithReusablePaths.yaml

@@ -2,6 +2,7 @@
 info:
   title: Webhook Example
   version: 1.0.0
+jsonSchemaDialect: "http://json-schema.org/draft-07/schema#"
 webhooks:
   /pets:
     "$ref": '#/components/pathItems/pets'

test/Microsoft.OpenApi.Tests/Models/OpenApiDocumentTests.cs

@@ -1439,7 +1439,7 @@ public async void SerializeDocumentWithWebhooksAsV3JsonWorks(bool produceTerseOu
             var writer = new OpenApiJsonWriter(outputStringWriter, new OpenApiJsonWriterSettings { Terse = produceTerseOutput });
 
             // Act
-            DocumentWithWebhooks.SerializeAsV3(writer, OpenApiSpecVersion.OpenApi3_1);
+            DocumentWithWebhooks.SerializeAsV31(writer);
             writer.Flush();
             var actual = outputStringWriter.GetStringBuilder().ToString();