patch 9.0.1276: some mappings with Meta and Shift do not work

Problem:    Some mappings with Meta and Shift do not work.
Solution:   Apply the Shift modifier to the key. (issue #11913)
diff --git a/src/version.c b/src/version.c
index 926cd7f..5bf3348 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1276,
+/**/
     1275,
 /**/
     1274,