Remove all of the random single-file deprecations

These are the changes that don't require a ton of changes to other files outside
of the original removal.

src/Dict.h

@@ -551,6 +551,3 @@ public:
 };
 
 } // namespace zeek
-
-using Dictionary [[deprecated("Remove in v4.1. Use zeek::Dictionary instead.")]] = zeek::Dictionary;
-template<typename T> using PDict [[deprecated("Remove in v4.1. Use zeek::PDict instead.")]] = zeek::PDict<T>;