Remove old containment operators @ and ~ for built-in geometry data
types.  These have been deprecated; use <@ and @> instead.

(Some contrib modules still contain the same deprecated operators.
That will be dealt with separately.)

Author: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://www.postgresql.org/message-id/flat/20201027032511.GF9241@telsasoft.com