patch 8.2.2692: Vim9: locked script variable can be changed

Problem:    Vim9: locked script variable can be changed.
Solution:   Check for locked value. (closes #8031)
diff --git a/src/version.c b/src/version.c
index 72b7987..1059585 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2692,
+/**/
     2691,
 /**/
     2690,