Bump BenchmarkDotNet and BenchmarkDotNet.Diagnostics.Windows (#919)

Bumps BenchmarkDotNet from 0.13.12 to 0.15.6
Bumps BenchmarkDotNet.Diagnostics.Windows from 0.13.12 to 0.15.6

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: BenchmarkDotNet.Diagnostics.Windows
  dependency-version: 0.15.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tests/FlowtideDotNet.Benchmarks/FlowtideDotNet.Benchmarks.csproj

@@ -10,8 +10,8 @@
 
   <ItemGroup>
     <PackageReference Include="Apache.Arrow.Compression" Version="22.1.0" />
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.12" />
-    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.13.12" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.6" />
+    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.6" />
   </ItemGroup>
 
   <ItemGroup>