Bump BenchmarkDotNet and BenchmarkDotNet.Diagnostics.Windows (#1266)

Bumps BenchmarkDotNet from 0.15.2 to 0.15.4
Bumps BenchmarkDotNet.Diagnostics.Windows from 0.15.2 to 0.15.4

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: BenchmarkDotNet.Diagnostics.Windows
  dependency-version: 0.15.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: martindevans

LLama.Benchmark/LLama.Benchmark.csproj

@@ -10,8 +10,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.15.2" />
-    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.2" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.4" />
+    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.4" />
   </ItemGroup>
 
     <ItemGroup>