[Chapel Merge] Add overload of `update()` for backwards compatibi

Branch: refs/heads/master
Revision: c4fe140
Author: dlongnecke-cray
Log Message:

Add overload of update() for backwards compatibility with 1.22 (#16547)

Add overload of update() for backwards compatibility with 1.22 (#16547)

Add an overload of map.update() that has the same behavior as the
1.22 version. It includes a compiler warning that issues a deprecation
warning, and recommends that users use extend() instead. The doc-
string for the 1.22 update() is used, along with an added
deprecation warning.