patch 8.2.4576: Vim9: error for comparing with null can be annoying

Problem:    Vim9: error for comparing with null can be annoying.
Solution:   Allow comparing anything with null. (closes #9948)
diff --git a/src/version.c b/src/version.c
index a68a662..c447509 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4576,
+/**/
     4575,
 /**/
     4574,