Sabrina Carpenter is officially in the New York groove. One week after pulling double duty as the host and musical guest on NBC’s “Saturday Night Live,” the pint-sized pop star is returning to the Big Apple for not one, not two, not three, not four but five (!) ‘Short n’ Sweet Tour’ concerts with special guests Olivia Dean and Amber Mark at Madison Square Garden. She’ll be at the Knicks and Rangers’ home on: Sunday, Oct. 26 7 p.m. Tuesday, Oct. 28 7 p.m. Wednesday, Oct. 29 7 p.m. Friday, Oct.