Add a missed PyErr_NoMemory() in symtable_new(). (GH-10576)

This missed PyErr_NoMemory() could cause a SystemError when calling
_symtable.symtable().
(cherry picked from commit ad65f15)

Co-authored-by: Zackery Spytz <[email protected]>

Author: miss-islington

Python/symtable.c

@@ -206,8 +206,10 @@ symtable_new(void)
     struct symtable *st;
 
     st = (struct symtable *)PyMem_Malloc(sizeof(struct symtable));
-    if (st == NULL)
+    if (st == NULL) {
+        PyErr_NoMemory();
         return NULL;
+    }
 
     st->st_filename = NULL;
     st->st_blocks = NULL;