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/indent/xhtml.vim b/runtime/indent/xhtml.vim
index 2197b79..e5c9cc3 100644
--- a/runtime/indent/xhtml.vim
+++ b/runtime/indent/xhtml.vim
@@ -1,7 +1,8 @@
 " Vim indent file
 " Language:	XHTML
-" Maintainer:	Bram Moolenaar <Bram@vim.org> (for now)
-" Last Change:	2005 Jun 24
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")