Bump Microsoft.SourceLink.GitHub from 1.0.0 to 8.0.0

Bumps [Microsoft.SourceLink.GitHub](https://github.com/dotnet/sourcelink) from 1.0.0 to 8.0.0.
- [Release notes](https://github.com/dotnet/sourcelink/releases)
- [Commits](dotnet/sourcelink@1.0.0...8.0.0)

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

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

Author: dependabot[bot]

Directory.Build.props

@@ -53,7 +53,7 @@ For a full set of changes, [please see the NBench 2.0.1 milestone on Github](htt
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
   </ItemGroup>
   <ItemGroup>
     <None Include="$(MSBuildThisFileDirectory)\README.md" Pack="true" Visible="false" PackagePath="\" />