build(deps): bump itext7.bouncy-castle-adapter and Microsoft.Extensions.Logging (#965)

Bumps itext7.bouncy-castle-adapter and [Microsoft.Extensions.Logging](https://github.com/dotnet/runtime). These dependencies needed to be updated together.

Updates `itext7.bouncy-castle-adapter` from 8.0.5 to 9.1.0

Updates `Microsoft.Extensions.Logging` from 9.0.0 to 5.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v9.0.0...v5.0.0)

---
updated-dependencies:
- dependency-name: itext7.bouncy-castle-adapter
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.Extensions.Logging
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

BervProject.MergePDF/BervProject.MergePDF.csproj

@@ -9,7 +9,7 @@
 
     <ItemGroup>
       <PackageReference Include="itext7" Version="8.0.5" />
-      <PackageReference Include="itext7.bouncy-castle-adapter" Version="8.0.5" />
+      <PackageReference Include="itext7.bouncy-castle-adapter" Version="9.1.0" />
       <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.0" />
     </ItemGroup>