Update dependency BenchmarkDotNet to 0.15.0

Author: renovate[bot]

Benchmarks/Serilog.Exceptions.Benchmark/Serilog.Exceptions.Benchmark.csproj

@@ -11,7 +11,7 @@
   </ItemGroup>
 
   <ItemGroup Label="Package References">
-    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.0" />
     <PackageReference Include="System.Reflection.Metadata" Version="9.0.2" />
   </ItemGroup>