Patch to remove inconsistency in dependency.c

Hi

Description:
=========

Inconsistency in dependency.c file's object_classes array elements and dependency.h file's enum ObjectClass elements. Following elements in object_classes array were missing.

ForeignDataWrapperRelationId   for             OCLASS_FDW
ForeignServerRelationId               for             OCLASS_FOREIGN_SERVER
UserMappingRelationId                 for            OCLASS_USER_MAPPING


Files Changed:
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1. src/backend/catalog/dependency.c

thanks

--Aqeel