Update LibGit2Sharp to work around bug. (#31)

See libgit2/libgit2sharp#1884

Author: ddunkin

tools/Build/Build.csproj

@@ -7,6 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Faithlife.Build" Version="5.11.2" />
+    <PackageReference Include="LibGit2Sharp" Version="0.27.0-preview-0100" />
   </ItemGroup>
 
 </Project>