Bump coverlet.msbuild from 2.8.0 to 2.9.0 (#291)

Bumps [coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) from 2.8.0 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] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Build.targets

@@ -32,7 +32,7 @@
         <PackageReference Update="Serilog.Sinks.XUnit" Version="2.0.4" />
         <PackageReference Update="XunitXml.TestLogger" Version="2.1.26" />
         <PackageReference Update="coverlet.collector" Version="1.2.0" />
-        <PackageReference Update="coverlet.msbuild" Version="2.8.0" />
+        <PackageReference Update="coverlet.msbuild" Version="2.9.0" />
         <PackageReference Update="System.Reactive" Version="4.4.1" />
         <PackageReference Update="System.Collections.Immutable" Version="1.7.1" />
         <PackageReference Update="Microsoft.Reactive.Testing" Version="4.3.2" />