patch 9.1.0000: Vim 9.1 release

Problem:  Need a new release
Solution: Release Vim 9.1

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index 92a8e3c..133d47a 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -1,4 +1,4 @@
-*message.txt*   For Vim version 9.0.  Last change: 2023 Dec 20
+*message.txt*   For Vim version 9.1.  Last change: 2023 Dec 20
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar