Bump NuGet.Packaging and System.Text.Json in /ApiSurface (#105)

Bumps [NuGet.Packaging](https://github.com/NuGet/NuGet.Client) and [System.Text.Json](https://github.com/dotnet/runtime). These dependencies needed to be updated together.

Updates `NuGet.Packaging` from 6.13.1 to 6.13.2
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

Updates `System.Text.Json` from 8.0.5 to 8.0.5
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.5...v8.0.5)

---
updated-dependencies:
- dependency-name: NuGet.Packaging
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Patrick Stevens <3138005+Smaug123@users.noreply.github.com>

Author: dependabot[bot]

ApiSurface/ApiSurface.fsproj

@@ -42,7 +42,7 @@
          are using nonvulnerable dependencies if they care.
          System.Text.Json is highly backward-compatible. -->
     <PackageReference Include="System.Text.Json" Version="8.0.5" NoWarn="%(NoWarn);NU1903" />
-    <PackageReference Include="NuGet.Packaging" Version="6.13.1" />
+    <PackageReference Include="NuGet.Packaging" Version="6.13.2" />
     <PackageReference Include="NuGet.Protocol" Version="6.13.1" />
     <PackageReference Include="System.IO.Abstractions" Version="4.2.13" />
   </ItemGroup>