Add Bundler 2.5.23 support

This commit adds support for downloading bundler 2.5.23 for applications with Bundler 2.5.x in their `Gemfile.lock`.

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [Unreleased]
 
 - Ruby apps using bundler 2.6+ will now receive bundler 2.6.2 ()
+- Ruby apps using bundler 2.5.x will now receive bundler 2.5.23 ()
 
 ## [v287] - 2024-12-25
 

changelogs/unreleased/bundler_2.5.23.md

@@ -0,0 +1,15 @@
+## Bundler version 2.5.23 is now available for Ruby Applications
+
+The [Ruby Buildpack](https://devcenter.heroku.com/articles/ruby-support#libraries) installs a version of bundler based on the major and minor version listed in the `Gemfile.lock` under the `BUNDLED WITH` key:
+
+- `BUNDLED WITH` 2.5.x will receive bundler `2.5.23`
+
+It is strongly recommended that you have both a `RUBY VERSION` and `BUNDLED WITH` version listed in your `Gemfile.lock`. If you do not have those values, you can generate them and commit them to git:
+
+```
+$ bundle update --ruby
+$ git add Gemfile.lock
+$ git commit -m "Update Gemfile.lock"
+```
+
+Applications without these values specified in the `Gemfile.lock` may break unexpectedly when the defaults change.

lib/language_pack/helpers/bundler_wrapper.rb

@@ -40,7 +40,7 @@ class LanguagePack::Helpers::BundlerWrapper
   # Heroku-20's oldest Ruby verison is 2.5.x which doesn't work with bundler 2.4
   BLESSED_BUNDLER_VERSIONS["2.3"] = "2.3.25"
   BLESSED_BUNDLER_VERSIONS["2.4"] = "2.4.22"
-  BLESSED_BUNDLER_VERSIONS["2.5"] = "2.5.6"
+  BLESSED_BUNDLER_VERSIONS["2.5"] = "2.5.23"
   BLESSED_BUNDLER_VERSIONS["2.6"] = "2.6.2"
   BLESSED_BUNDLER_VERSIONS.default_proc = Proc.new do |hash, key|
     if Gem::Version.new(key).segments.first == 1