patch 8.2.1443: Vim9: crash when interrupting a nested :def function

Problem:    Vim9: crash when interrupting a nested :def function.
Solution:   Push a dummy return value onto the stack. (closes #6701)

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1443,
 /**/
     1442,
 /**/