Bump Microsoft.SourceLink.GitHub from 1.0.0 to 1.1.1 (#128)

Bumps [Microsoft.SourceLink.GitHub](https://github.com/dotnet/sourcelink) from 1.0.0 to 1.1.1.
- [Release notes](https://github.com/dotnet/sourcelink/releases)
- [Commits](dotnet/sourcelink@1.0.0...1.1.1)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Directory.Build.props

@@ -25,7 +25,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.VisualStudio.Internal.MicroBuild.VisualStudio" Version="$(MicroBuildVersion)" PrivateAssets="all" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.2" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="all" />
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.4.244" PrivateAssets="all" />
     <PackageReference Include="Microsoft.Net.Compilers.Toolset" Version="4.0.0" PrivateAssets="all" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.354" PrivateAssets="all" />