patch 8.2.4227: Vim9: using "lockvar!" in :def function does not work

Problem:    Vim9: using "lockvar!" in :def function does not work.
Solution:   Add "!" instead of "-1". (closes #9634)
diff --git a/src/version.c b/src/version.c
index 576c06c..e77826c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4227,
+/**/
     4226,
 /**/
     4225,