chore(deps): update dependency microsoft.openapi.readers to v1.6.15 (arcus-azure#890)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Arcus.Templates.Tests.Integration/Arcus.Templates.Tests.Integration.csproj

@@ -41,7 +41,7 @@
     <PackageReference Include="Flurl.Http" Version="4.0.2" />
     <PackageReference Include="Microsoft.Azure.ApplicationInsights.Query" Version="1.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.14" />
+    <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.15" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="xunit" Version="2.8.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.0">