Bump BenchmarkDotNet and BenchmarkDotNet.Diagnostics.Windows

Bumps BenchmarkDotNet from 0.12.1 to 0.15.8
Bumps BenchmarkDotNet.Diagnostics.Windows from 0.12.1 to 0.15.8

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

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

Author: dependabot[bot]

Philips.CodeAnalysis.Benchmark/Philips.CodeAnalysis.Benchmark.csproj

@@ -9,8 +9,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
-    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.12.1" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
+    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.8" />
     <PackageReference Include="Microsoft.CodeAnalysis" Version="3.6.0" />
   </ItemGroup>