patch 8.2.4487: Vim9: cannot compare with v:null

Problem:    Vim9: cannot compare with v:null.
Solution:   Allow comparing anything with v:null. (closes #9866)
diff --git a/src/version.c b/src/version.c
index e563142..960e18c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4487,
+/**/
     4486,
 /**/
     4485,