Bump the nuget group with 1 update

Bumps NuGet.Packaging from 6.12.1 to 6.12.5

---
updated-dependencies:
- dependency-name: NuGet.Packaging
  dependency-version: 6.12.5
  dependency-type: direct:production
  dependency-group: nuget
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -15,6 +15,7 @@
     <PackageVersion Include="MimeKit" Version="4.16.0" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.4" />
     <PackageVersion Include="Newtonsoft.Json.Schema" Version="4.0.1" />
+    <PackageVersion Include="NuGet.Packaging" Version="6.12.5" />
     <PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="1.15.2" />
     <PackageVersion Include="OpenTelemetry.Exporter.Console" Version="1.15.3" />
     <PackageVersion Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.15.1" />