patch 8.2.1849: Vim9: garbage collection frees block-local variables

Problem:    Vim9: garbage collection frees block-local variables.
Solution:   Mark all script variables as used.
diff --git a/src/version.c b/src/version.c
index b0fe5e8..8ea210a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1849,
+/**/
     1848,
 /**/
     1847,