Bump BenchmarkDotNet and Microsoft.CodeAnalysis.CSharp

Bumps BenchmarkDotNet from 0.14.0 to 0.15.8
Bumps Microsoft.CodeAnalysis.CSharp from 4.12.0 to 4.14.0

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.8
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Microsoft.CodeAnalysis.CSharp
  dependency-version: 4.14.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -22,8 +22,8 @@
     <PackageVersion Include="System.Text.Json" Version="$(SystemTextJsonVer)" />
   </ItemGroup>
   <ItemGroup Label="Compile dependencies">
-    <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
+    <PackageVersion Include="BenchmarkDotNet" Version="0.15.8" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.14.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
     <PackageVersion Include="MinVer" Version="6.0.0" />
     <PackageVersion Include="Nullable" Version="1.3.1" />