Downgrade Nerdbank.GitVersioning for net6.0 runtime

Author: sharwell

StyleCop.Analyzers/Directory.Build.props

@@ -45,7 +45,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Nerdbank.GitVersioning" Version="3.9.50" PrivateAssets="all" />
+    <PackageReference Include="Nerdbank.GitVersioning" Version="3.6.146" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>