Bump up version to 6.9.12

Author: Roberto Garcia

Source/MySql.Data/Properties/VersionInfo.cs

@@ -38,6 +38,6 @@
 // You can specify all the values or you can default the Revision and Build Numbers 
 // by using the '*' as shown below:
 
-[assembly: AssemblyVersion("6.9.11")]
-[assembly: AssemblyInformationalVersion("6.9.11")]
+[assembly: AssemblyVersion("6.9.12")]
+[assembly: AssemblyInformationalVersion("6.9.12")]
 [assembly: NeutralResourcesLanguage("en-US")]