patch 9.0.1409: racket files are recognized as scheme

Problem:    Racket files are recognized as scheme.
Solution:   Recognize rackets files separately. (Gabriel Kakizaki,
            closes #12164, closes #12162)
diff --git a/src/version.c b/src/version.c
index ec28568..27d4b12 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1409,
+/**/
     1408,
 /**/
     1407,