build(deps): bump System.Text.Json from 7.0.3 to 8.0.0

Bumps [System.Text.Json](https://github.com/dotnet/runtime) from 7.0.3 to 8.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v7.0.3...v8.0.0)

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

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

LLama/LLamaSharp.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <RootNamespace>LLama</RootNamespace>
@@ -43,7 +43,7 @@
     <PackageReference Include="IsExternalInit" Version="1.0.3" PrivateAssets="all" />
     <PackageReference Include="System.Memory" Version="4.5.5" PrivateAssets="all" />
     <PackageReference Include="System.Linq.Async" Version="6.0.1" />
-    <PackageReference Include="System.Text.Json" Version="7.0.3" />
+    <PackageReference Include="System.Text.Json" Version="8.0.0" />
   </ItemGroup>
 
   <ItemGroup>