bpo-40880: Fix invalid read in newline_in_string in pegen.c (#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>
2 files changed