chore(deps): bump System.Text.Json (#36)

Bumps [System.Text.Json](https://github.com/dotnet/runtime) from 8.0.0-preview.5.23280.8 to 8.0.0-preview.6.23329.7.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0-preview.5.23280.8...v8.0.0-preview.6.23329.7)

---
updated-dependencies:
- 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>

src/Pinecone.csproj

@@ -23,7 +23,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net7.0'">
-    <PackageReference Include="System.Text.Json" Version="8.0.0-preview.5.23280.8" />
+    <PackageReference Include="System.Text.Json" Version="8.0.0-preview.6.23329.7" />
     <PackageReference Include="PolySharp" Version="1.13.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>