Bump BenchmarkDotNet and BenchmarkDotNet.Diagnostics.Windows

Bumps BenchmarkDotNet from 0.15.6 to 0.15.8
Bumps BenchmarkDotNet.Diagnostics.Windows from 0.15.6 to 0.15.8

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: BenchmarkDotNet.Diagnostics.Windows
  dependency-version: 0.15.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

tests/CSRakowski.Parallel.Benchmarks/CSRakowski.Parallel.Benchmarks.csproj

@@ -10,12 +10,12 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.15.6" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
     <PackageReference Include="CSRakowski.AsyncStreamsPreparations" Version="1.6.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFrameworkIdentifier)' == '.NETFramework' ">
-    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.6" />
+    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.8" />
   </ItemGroup>
 
   <ItemGroup>