By Steve Dinneen Comedies about old people rebelling against the system have been pretty popular in cinema, from the jagged barbs of The Holdovers to the chaos of 2019’s Lucky Grandma and last year’s sentimental The Great Escaper. However, new action-comedy Thelma tackles the subject in a new and impressive way. June Squibb (last heard as the voice of Inside Out 2’s Nostalgia) plays Thelma, a 93-year-old widow who is duped out of $10,000 by a con man claiming to be her grandson. Enraged by the theft, she takes an old friend (Richard Roundtree) and his scooter on a slow rampage of revenge. Josh…