utils/gems: update Bundler version

Signed-off-by: Patrick Linnane <[email protected]>

Author: p-linnane

Library/Homebrew/Gemfile.lock

@@ -213,4 +213,4 @@ RUBY VERSION
    ruby 3.3.8p144
 
 BUNDLED WITH
-   2.6.7
+   2.5.22

Library/Homebrew/utils/gems.rb

@@ -10,7 +10,7 @@
 module Homebrew
   # Keep in sync with the `Gemfile.lock`'s BUNDLED WITH.
   # After updating this, run `brew vendor-gems --update=--bundler`.
-  HOMEBREW_BUNDLER_VERSION = "2.5.20"
+  HOMEBREW_BUNDLER_VERSION = "2.5.22"
 
   # Bump this whenever a committed vendored gem is later added to or exclusion removed from gitignore.
   # This will trigger it to reinstall properly if `brew install-bundler-gems` needs it.