patch 8.2.4889: CI only tests with FreeBSD 12

Problem:    CI only tests with FreeBSD 12.
Solution:   Also test with FreeBSD 13. (closes #10366)
diff --git a/src/version.c b/src/version.c
index 25c459e..1b781d9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4889,
+/**/
     4888,
 /**/
     4887,