patch 8.2.0729: Vim9: When reloading a script variables are not cleared

Problem:    Vim9: When reloading a script variables are not cleared.
Solution:   When sourcing a script again clear all script-local variables.
diff --git a/src/version.c b/src/version.c
index c595e9d..4bf6242 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    729,
+/**/
     728,
 /**/
     727,