Bump coverlet.msbuild from 2.8.1 to 2.9.0

Bumps [coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) from 2.8.1 to 2.9.0.
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](https://github.com/coverlet-coverage/coverlet/commits)

Signed-off-by: dependabot[bot] <support@github.com>

test/Library.Tests/Library.Tests.csproj

@@ -5,7 +5,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.msbuild" Version="2.8.1" />
+    <PackageReference Include="coverlet.msbuild" Version="2.9.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />