chore(deps): update microsoft.testing to 18.8.0

Author: renovate[bot]

src/Directory.Packages.props

@@ -18,7 +18,7 @@
     <PackageVersion Include="TUnit" Version="1.49.0" />
     <PackageVersion Include="TUnit.Core" Version="1.49.0" />
     <PackageVersion Include="Verify.TUnit" Version="31.19.0" />
-    <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.7.0" />
+    <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.8.0" />
     <PackageVersion Include="Microsoft.Testing.Platform.MSBuild" Version="2.2.3" />
   </ItemGroup>
   <ItemGroup>