patch 9.0.0367: Coverity complains about dropping sign of character

Problem:    Coverity complains about dropping sign of character.
Solution:   Add explicit type cast.
diff --git a/src/version.c b/src/version.c
index 1c685d1..e8f40e4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -708,6 +708,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    367,
+/**/
     366,
 /**/
     365,