patch 9.1.1906: filetype: not all Ruby files are recognized

Problem:  filetype: not all Ruby files are recognized
Solution: Detect *.rbi and Brewfile as ruby filetype
          (botantony).

- `rbi` is a file extension used by Sorbet, typechecker for Ruby:
   https://sorbet.org/docs/rbi

- `Brewfile` is a bundler file for Homebrew package manager:
   https://docs.brew.sh/Brew-Bundle-and-Brewfile

closes: #18697

Signed-off-by: botantony <antonsm21@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/autoload/dist/ft.vim

@@ -3,7 +3,7 @@ vim9script
 # Vim functions for file type detection
 #
 # Maintainer:		The Vim Project <https://github.com/vim/vim>
-# Last Change:		2025 Oct 31
+# Last Change:		2025 Nov 11
 # Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 # These functions are moved here from runtime/filetype.vim to make startup
@@ -2571,6 +2571,8 @@ const ft_from_ext = {
   "builder": "ruby",
   "rxml": "ruby",
   "rjs": "ruby",
+  # Sorbet (Ruby typechecker)
+  "rbi": "ruby",
   # Rust
   "rs": "rust",
   # S-lang
@@ -2999,6 +3001,8 @@ const ft_from_name = {
   "apt.conf": "aptconf",
   # BIND zone
   "named.root": "bindzone",
+  # Brewfile (uses Ruby syntax)
+  "Brewfile": "ruby",
   # Busted (Lua unit testing framework - configuration files)
   ".busted": "lua",
   # Bun history