Merge pull request #194: git: upgrade to latest features/sparse-checkout-2.23.0

Upgrade to 2.20191023.7-sc which corresponds to commit microsoft/git@a782a7e and includes the following changes (since 2.20191015.2-sc):

- microsoft/git#208
- microsoft/git#210

Author: derrickstolee

Scalar.Build/Scalar.props

@@ -3,7 +3,7 @@
 
   <PropertyGroup Label="Parameters">
     <ScalarVersion>0.2.173.2</ScalarVersion>
-    <GitPackageVersion>2.20191015.2-sc</GitPackageVersion>
+    <GitPackageVersion>2.20191023.7-sc</GitPackageVersion>
   </PropertyGroup>
 
   <PropertyGroup Label="DefaultSettings">