patch 8.2.1824: Vim9: variables at the script level escape their scope

Problem:    Vim9: variables at the script level escape their scope.
Solution:   When leaving a scope remove variables declared in it.
diff --git a/src/version.c b/src/version.c
index e30c02d..e7e863b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1824,
+/**/
     1823,
 /**/
     1822,