patch 8.2.3028: GUI mouse events not tested

Problem:    GUI mouse events not tested.
Solution:   Add test_gui_mouse_event().  Add mouse tests. Also add a few
            viminfo tests. (Yegappan Lakshmanan, closes #8407)
diff --git a/src/version.c b/src/version.c
index 58d99e8..db2433d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3028,
+/**/
     3027,
 /**/
     3026,