Delete explicit SourceLink reference, which is in the SDK

Author: Smaug123

Directory.Build.props

@@ -17,8 +17,6 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.9.50" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="10.0.102" PrivateAssets="All" />
-    <SourceLinkGitHubHost Include="github.com" ContentUrl="https://raw.githubusercontent.com" />
   </ItemGroup>
   <PropertyGroup Condition="'$(GITHUB_ACTION)' != ''">
     <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>