Updated packages.config

Author: jjonescz

src/GtmExtension/packages.config

@@ -21,5 +21,5 @@
   <package id="Microsoft.VisualStudio.Threading.Analyzers" version="15.8.122" targetFramework="net471" />
   <package id="Microsoft.VisualStudio.Utilities" version="15.0.26228" targetFramework="net471" />
   <package id="Microsoft.VisualStudio.Validation" version="15.0.82" targetFramework="net471" />
-  <package id="Microsoft.VSSDK.BuildTools" version="15.8.3246" targetFramework="net471" developmentDependency="true" />
+  <package id="Microsoft.VSSDK.BuildTools" version="15.8.3247" targetFramework="net471" developmentDependency="true" />
 </packages>