Bump BenchmarkDotNet from 0.13.12 to 0.15.4

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tests/Relay.Core.Tests/Relay.Core.Tests.csproj

@@ -29,7 +29,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.9" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="9.0.9" />
     <PackageReference Include="Scrutor" Version="4.2.2" />
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.12" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.4" />
   </ItemGroup>
 
   <ItemGroup>