chore(deps): update dependency coverlet.msbuild to v8 (#383)

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

Author: renovate[bot]

src/Directory.Packages.props

@@ -37,7 +37,7 @@
     <PackageVersion Include="NUnit.Analyzers" Version="4.11.2" />
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.1.0" />
     <PackageVersion Include="PublicApiGenerator" Version="11.5.4" />
-    <PackageVersion Include="coverlet.msbuild" Version="6.0.4" />
+    <PackageVersion Include="coverlet.msbuild" Version="8.0.0" />
     <PackageVersion Include="Verify.NUnit" Version="31.12.5" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.5.0" />
     <PackageVersion Include="ReactiveMarbles.SourceGenerator.TestNuGetHelper" Version="1.3.1" />