patch 9.0.0894: virtual text property highlight ignores window background

Problem:    Virtual text property highlight ignores window background.
Solution:   Combine text prop attribute with win_attr into extra_attr.
            (closes #11462)
diff --git a/src/version.c b/src/version.c
index cfdd33a..f4e9ee1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    894,
+/**/
     893,
 /**/
     892,