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

src/message.c

@@ -1114,7 +1114,7 @@ ex_messages(exarg_T *eap)
 	    msg_attr(
 		    // Translator: Please replace the name and email address
 		    // with the appropriate text for your translation.
-		    _("Messages maintainer: Bram Moolenaar <Bram@vim.org>"),
+		    _("Messages maintainer: The Vim Project"),
 		    HL_ATTR(HLF_T));
     }