patch 8.2.1825: Vim9: accessing freed memory

Problem:    Vim9: accessing freed memory.
Solution:   Clear sv_name when the variable is deleted.
diff --git a/src/version.c b/src/version.c
index e7e863b..789e104 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1825,
+/**/
     1824,
 /**/
     1823,