Update FxCop analyzers version to fix build

Author: zvirja

Src/Common.props

@@ -59,7 +59,7 @@
   </Choose>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.3.0-beta1" ExcludeAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.6.0-beta2" ExcludeAssets="all" />
   </ItemGroup>
 
   <ItemGroup>