patch 9.0.0976: enabling the kitty keyboard protocol uses push/pop

Problem:    Enabling the kitty keyboard protocol uses push/pop.
Solution:   Use the start/stop codes to avoid unpredictable behavior.
diff --git a/src/version.c b/src/version.c
index 98f1cf2..37d7c8f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    976,
+/**/
     975,
 /**/
     974,