Bump YamlDotNet from 6.0.0 to 6.1.1

Bumps [YamlDotNet](https://github.com/aaubry/YamlDotNet) from 6.0.0 to 6.1.1.
- [Release notes](https://github.com/aaubry/YamlDotNet/releases)
- [Changelog](https://github.com/aaubry/YamlDotNet/blob/master/RELEASE_NOTES.md)
- [Commits](aaubry/YamlDotNet@v6.0.0...v6.1.1)

Author: dependabot-preview[bot]

src/Directory.Build.props

@@ -17,6 +17,6 @@
     <PackageVersion_LibGit2Sharp>0.25.0-preview-0033</PackageVersion_LibGit2Sharp>
     <PackageVersion_LibGit2SharpNativeBinaries>[1.0.185]</PackageVersion_LibGit2SharpNativeBinaries>
     <PackageVersion_JetBrainsAnnotations>2019.1.1</PackageVersion_JetBrainsAnnotations>
-    <PackageVersion_YamlDotNet>6.0.0</PackageVersion_YamlDotNet>
+    <PackageVersion_YamlDotNet>6.1.1</PackageVersion_YamlDotNet>
  </PropertyGroup>
 </Project>