patch 9.1.1405: tests: no test for mapping with special keys in session file

Problem:  tests: no test for mapping with special keys in session file.
Solution: Add a special keys to an existing test.  Also test with UTF-8
          characters containing 0x80 or 0x9b bytes (zeertzjq).

closes: #17360

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 9cecc0b..c45c65e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1405,
+/**/
     1404,
 /**/
     1403,