Update WebDriverManager.Tests.csproj

Author: rosolko

WebDriverManager.Tests/WebDriverManager.Tests.csproj

@@ -7,7 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="coverlet.msbuild" Version="2.6.0" />
+        <PackageReference Include="coverlet.msbuild" Version="2.5.1" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
         <PackageReference Include="xunit" Version="2.4.1" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />