(new-cli deps): Bump LibGit2Sharp from 0.27.2 to 0.28.0 in /new-cli

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]>

Author: dependabot[bot]

new-cli/Directory.Packages.props

@@ -3,7 +3,7 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="LibGit2Sharp" Version="0.27.2" />
+    <PackageVersion Include="LibGit2Sharp" Version="0.28.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.7.0" />
     <PackageVersion Include="Microsoft.CSharp" Version="4.7.0" />