patch 8.1.2097: :mksession is not sufficiently tested

Problem:    :mksession is not sufficiently tested.
Solution:   Add more test cases. (Yegappan Lakshmanan, closes #4992)
diff --git a/src/version.c b/src/version.c
index 8890193..736a632 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2097,
+/**/
     2096,
 /**/
     2095,