patch 8.2.4323: Vim9: nested function name can start with "_"

Problem:    Vim9: nested function name can start with "_".
Solution:   Use same rule for function name for nested functions.
            (closes #9713)
diff --git a/src/version.c b/src/version.c
index c1f90cd..2d0bb2d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4323,
+/**/
     4322,
 /**/
     4321,