update file path to moved file

Author: MaggieKimani1

test/Microsoft.OpenApi.Readers.Tests/OpenApiReaderTests/OpenApiStreamReaderTests.cs

@@ -55,7 +55,7 @@ public async Task StreamShouldReadWhenInitializedAsync()
                 BaseAddress = new Uri("https://raw.githubusercontent.com/OAI/OpenAPI-Specification/")
             };
 
-            var stream = await httpClient.GetStreamAsync("main/tests/v3.0/pass/petstore.yaml");
+            var stream = await httpClient.GetStreamAsync("20fe7a7b720a0e48e5842d002ac418b12a8201df/tests/v3.0/pass/petstore.yaml");
 
             // Read V3 as YAML
             var openApiDocument = new OpenApiStreamReader().Read(stream, out var diagnostic);