File antlr4-4.9.3.jar is twice as big as antlr4-4.9.2.jar (2 640 255 vs 1 231 617 bytes).
Using 7-zip I can track difference to org\antlr\v4\unicode directory.
Using JD-GUI (Java decompiler) I can see, that in 4.9.3 there are additional wrapper classes which probably increase file size.