Bump BenchmarkDotNet and BenchmarkDotNet.Diagnostics.Windows

Bumps BenchmarkDotNet from 0.15.7 to 0.15.8
Bumps BenchmarkDotNet.Diagnostics.Windows from 0.15.7 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] <[email protected]>

Author: dependabot[bot]

performance/benchmark/PerformanceTests.csproj

@@ -15,8 +15,8 @@
     <NoWarn>CA1822;CS9057;</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.15.7" />
-    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.7" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
+    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.8" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\Microsoft.OpenApi\Microsoft.OpenApi.csproj" />