build(deps): bump the all group with 1 update

Bumps the all group with 1 update: [System.Threading.Channels](https://github.com/dotnet/runtime).

- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v7.0.0...v8.0.0)

---
updated-dependencies:
- dependency-name: System.Threading.Channels
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all
...

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

src/libs/H.OpenVpn/H.OpenVpn.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net4.6.2;net6.0;net7.0</TargetFrameworks>
@@ -17,7 +17,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Threading.Channels" Version="7.0.0" />
+    <PackageReference Include="System.Threading.Channels" Version="8.0.0" />
   </ItemGroup>
 
 </Project>