patch 8.2.3901: Vim9: Cannot set 'cpo' in main .vimrc if using Vim9 script

Problem:    Vim9: Cannot set 'cpo' in main .vimrc if using Vim9 script.
Solution:   Do not restore 'cpo' at the end of the main .vimrc.
diff --git a/src/version.c b/src/version.c
index 1ada856..9a5ef2c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3901,
+/**/
     3900,
 /**/
     3899,