Remove sourcelink dependency (#9105)

Sourcelink dependency isn't needed anymore. Arcade uses sourcelink tooling that is included in .NET SDK 8.0 preview 6.

Author: NikolaMilosavljevic

eng/Version.Details.xml

@@ -48,11 +48,6 @@
       <Sha>54dd37d44a2adfb8b966fac466c2ece40f8b20dd</Sha>
       <SourceBuild RepoName="arcade" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.SourceLink.GitHub" Version="8.0.0-beta.23211.2" CoherentParentDependency="Microsoft.DotNet.Arcade.Sdk">
-      <Uri>https://github.com/dotnet/sourcelink</Uri>
-      <Sha>4cf2eb17c295905edeca76a9afe6dda42988359e</Sha>
-      <SourceBuild RepoName="sourcelink" ManagedOnly="true" />
-    </Dependency>
     <Dependency Name="Microsoft.DotNet.XliffTasks" Version="1.0.0-beta.23374.1" CoherentParentDependency="Microsoft.DotNet.Arcade.Sdk">
       <Uri>https://github.com/dotnet/xliff-tasks</Uri>
       <Sha>a61cdec7a7f96c654b8c92bea0167df0427cc26c</Sha>