MINOR: [C#] Bump BenchmarkDotNet from 0.14.0 to 0.15.2

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

csharp/test/Apache.Arrow.Benchmarks/Apache.Arrow.Benchmarks.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.2" />
     <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.14.0" />
   </ItemGroup>