Fix tests

Reset `Stream` after copy.

Author: martincostello

src/Swashbuckle.AspNetCore.ApiTesting/ApiTestRunnerOptionsExtensions.cs

@@ -12,6 +12,7 @@ public static void AddOpenApiFile(this ApiTestRunnerOptions options, string docu
             using var memoryStream = new MemoryStream();
 
             fileStream.CopyTo(memoryStream);
+            memoryStream.Seek(0, SeekOrigin.Begin);
 
             var result = OpenApiDocument.Load(memoryStream);
             options.OpenApiDocs.Add(documentName, result.Document);

test/WebSites/TestFirst/wwwroot/swagger/v1-generated/openapi.json

@@ -1,5 +1,5 @@
 {
-  "openapi": "3.0.1",
+  "openapi": "3.0.4",
   "info": {
     "title": "Test-first Example API (Generated)",
     "version": "v1"

test/WebSites/TestFirst/wwwroot/swagger/v1-imported/openapi.json

@@ -1,5 +1,5 @@
 {
-  "openapi": "3.0.1",
+  "openapi": "3.0.4",
   "info": {
     "title": "Test-first Example API (Imported)",
     "version": "v1"