Update ReportGenerator to version 4.8.7

Author: 0xced

tests/Serilog.Formatting.Log4Net.Tests.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="FluentAssertions" Version="5.10.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
     <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
-    <PackageReference Include="ReportGenerator" Version="4.8.6" />
+    <PackageReference Include="ReportGenerator" Version="4.8.7" />
     <PackageReference Include="Serilog.Enrichers.Environment" Version="2.1.3" />
     <PackageReference Include="Serilog.Enrichers.Thread" Version="3.1.0" />
     <PackageReference Include="xunit" Version="2.4.1" />