patch 9.1.0106: Visual highlight hard to read with 'termguicolors'

Problem:  Visual highlight hard to read with 'termguicolors'
          (Maxim Kim)
Solution: Set Visual GUI foreground to black (with background=light)
          and lightgrey (with background=dark)
          (Maxim Kim)

fixes: #14024
closes: #14025

Signed-off-by: Maxim Kim <habamax@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 65b6530..c79fd6b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    106,
+/**/
     105,
 /**/
     104,