chore(deps): update dependency mstest to 3.9.1

Author: renovate[bot]

dotnet/Cucumber.HtmlFormatterTest/Cucumber.HtmlFormatterTest.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.0" />
-    <PackageReference Include="MSTest" Version="3.9.0" />
+    <PackageReference Include="MSTest" Version="3.9.1" />
   </ItemGroup>
 
   <ItemGroup>