Bump Microsoft.SourceLink.GitHub from 1.1.1 to 8.0.0

---
updated-dependencies:
- dependency-name: Microsoft.SourceLink.GitHub
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Ix.NET/Source/Directory.Build.props

@@ -29,7 +29,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All"/>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All"/>
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.8.118" PrivateAssets="all" />
   </ItemGroup>