Bump ReportGenerator from 5.1.12 to 5.1.13

Bumps [ReportGenerator](https://github.com/danielpalme/ReportGenerator) from 5.1.12 to 5.1.13.
- [Release notes](https://github.com/danielpalme/ReportGenerator/releases)
- [Commits](danielpalme/ReportGenerator@v5.1.12...v5.1.13)

---
updated-dependencies:
- dependency-name: ReportGenerator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tests/Serilog.Formatting.Log4Net.Tests.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="FluentAssertions" Version="6.8.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="PublicApiGenerator" Version="10.3.0" />
-    <PackageReference Include="ReportGenerator" Version="5.1.12" PrivateAssets="all" />
+    <PackageReference Include="ReportGenerator" Version="5.1.13" PrivateAssets="all" />
     <PackageReference Include="Serilog" Version="2.12.0" />
     <PackageReference Include="Serilog.Enrichers.Environment" Version="2.2.0" />
     <PackageReference Include="Serilog.Enrichers.Thread" Version="3.1.0" />