patch 9.0.0422: not enough testing of the :all command

Problem:    Not enough testing of the :all command.
Solution:   Add more testing. (Yegappan Lakshmanan, closes #11091)
diff --git a/src/version.c b/src/version.c
index c232a7b..fe87dab 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    422,
+/**/
     421,
 /**/
     420,