Remove explicit Microsoft.SourceLink.GitHub references (built into .NET 8+ SDK)

Co-authored-by: Tyrrrz <1935960+Tyrrrz@users.noreply.github.com>

Author: Copilot

Directory.Packages.props

@@ -12,7 +12,6 @@
     <PackageVersion Include="System.Text.Json" Version="10.0.3" />
     <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.6.3" />
     <PackageVersion Include="CliWrap" Version="3.10.0" />
-    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.103" />
     <PackageVersion Include="Gress" Version="2.1.1" />
     <PackageVersion Include="AsyncImageLoader.Avalonia" Version="3.6.0" />
     <PackageVersion Include="Avalonia" Version="11.3.12" />

YoutubeExplode.Converter/YoutubeExplode.Converter.csproj

@@ -26,7 +26,6 @@
   <ItemGroup>
     <PackageReference Include="CliWrap" />
     <PackageReference Include="CSharpier.MsBuild" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" PrivateAssets="all" />
     <PackageReference Include="PolyShim" PrivateAssets="all" />
   </ItemGroup>
 

YoutubeExplode/YoutubeExplode.csproj

@@ -30,7 +30,6 @@
       Include="Microsoft.Bcl.AsyncInterfaces"
       Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'netstandard2.1'))"
     />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" PrivateAssets="all" />
     <PackageReference Include="PolyShim" PrivateAssets="all" />
     <!-- System.Text.Json is downgraded to v9.0.2 for netstandard2.0 targets to maintain compatibility
          with UWP projects using the .NET Native Toolchain, which cannot handle v10.x.