Farewell to Bram and dedicate upcoming Vim 9.1 to him (#12749)

* Dedicate upcoming Vim 9.1 to Bram

Also replace in a few more places Brams email address and mention new
maintainers.

* Remove Bram from any Maintainer role

* runtime: Align Header

* it's mailing list not mailinglist
diff --git a/runtime/syntax/model.vim b/runtime/syntax/model.vim
index 5f3b7f8..ea661eb 100644
--- a/runtime/syntax/model.vim
+++ b/runtime/syntax/model.vim
@@ -1,7 +1,8 @@
 " Vim syntax file
 " Language:	Model
-" Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2005 Jun 20
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " very basic things only (based on the vgrindefs file).
 " If you use this language, please improve it, and send me the patches!