chore(deps): bump LibGit2Sharp from 0.27.2 to 0.28.0 (#99)

Bumps [LibGit2Sharp](https://github.com/libgit2/libgit2sharp) from 0.27.2 to 0.28.0.
- [Release notes](https://github.com/libgit2/libgit2sharp/releases)
- [Changelog](https://github.com/libgit2/libgit2sharp/blob/master/CHANGES.md)
- [Commits](libgit2/libgit2sharp@0.27.2...0.28.0)

---
updated-dependencies:
- dependency-name: LibGit2Sharp
  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]

Directory.Packages.props

@@ -6,7 +6,7 @@
   <ItemGroup>
     <PackageVersion Include="GitHubActionsTestLogger" Version="2.3.3" />
     <PackageVersion Include="IntelliTect.TestTools.Console" Version="1.0.0-CI-20181030-214503" />
-    <PackageVersion Include="LibGit2Sharp" Version="0.27.2" />
+    <PackageVersion Include="LibGit2Sharp" Version="0.28.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
     <PackageVersion Include="Polly" Version="8.0.0" />