patch 8.2.4321: Vim9: crash when using a funcref to a closure

Problem:    Vim9: crash when using a funcref to a closure.
Solution:   Copy pt_outer to the new partial. (closes #9714)
diff --git a/src/version.c b/src/version.c
index 4fdeb2f..97bcfde 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4321,
+/**/
     4320,
 /**/
     4319,