bpo-40880: Fix invalid read in newline_in_string in pegen.c (GH-20666)


* bpo-40880: Fix invalid read in newline_in_string in pegen.c

* Update Parser/pegen/pegen.c

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>

* Add NEWS entry

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
(cherry picked from commit 2e6593db0086004a1ca7f7049218ff9573d473c2)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
2 files changed