It’s time for a happy birthday, but maybe it’s also a kind of graduation into the next realm, as the “Chilling Adventures of Sabrina,” is coming to an end and its next season, is its final one. Part 4 of “Chilling Adventures of Sabrina,” as it likes to be called, focuses on witches and covens and, you know, a big fight against the forces of darkness while balancing some teenage love in the process.