[3.14] valgrind-python.supp: Update suppression for readline leaks (pythonGH-151783) (python#152085)

`valgrind-python.supp`: Update suppression for readline leaks (pythonGH-151783)
(cherry picked from commit 28b63d3)

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: miss-islington

Misc/valgrind-python.supp

@@ -317,13 +317,8 @@
 {
    Avoid problems w/readline doing a putenv and leaking on exit
    Memcheck:Leak
-   fun:malloc
-   fun:xmalloc
-   fun:sh_set_lines_and_columns
-   fun:_rl_get_screen_size
-   fun:_rl_init_terminal_io
-   obj:/lib/libreadline.so.4.3
-   fun:rl_initialize
+   ...
+   fun:setup_readline
 }
 
 # Valgrind emits "Conditional jump or move depends on uninitialised value(s)"