patch 8.2.3116: Vim9: crash when debugging a function with line continuation

Problem:    Vim9: crash when debugging a function with line continuation.
Solution:   Check for a NULL pointer. (closes #8521)
diff --git a/src/version.c b/src/version.c
index e2f74e9..1deb3e4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3116,
+/**/
     3115,
 /**/
     3114,