Bump Microsoft.SourceLink.GitHub from 1.0.0 to 1.1.1 (#91)

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] <[email protected]>

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

Author: dependabot[bot]

NLog.Windows.Forms/NLog.Windows.Forms.csproj

@@ -37,7 +37,7 @@ Added support for .NET Core 3.1 and .NET 5 (#42) (@weltkante, @304NotModified)
 
   <ItemGroup>
     <PackageReference Include="NLog" Version="4.7.12" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
   </ItemGroup>
   <ItemGroup>
     <Reference Include="System.Windows.Forms" />