Update libgit2 to v0.28.3

Author: ethomson

LibGit2Sharp/LibGit2Sharp.csproj

@@ -27,7 +27,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="LibGit2Sharp.NativeBinaries" Version="[2.0.278]" PrivateAssets="none" />
+    <PackageReference Include="LibGit2Sharp.NativeBinaries" Version="[2.0.289]" PrivateAssets="none" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-63127-02" PrivateAssets="all" />
     <PackageReference Include="Nerdbank.GitVersioning" Version="2.3.138" PrivateAssets="all" />
   </ItemGroup>