Prepare release v315 (heroku#1623)

Co-authored-by: heroku-linguist[bot] <136119646+heroku-linguist[bot]@users.noreply.github.com>

Author: heroku-linguist[bot]

CHANGELOG.md

@@ -3,6 +3,11 @@
 ## [Unreleased]
 
 
+## [v315] - 2025-07-24
+
+- Ruby 3.2.9 and 3.3.9 is now available
+
+
 ## [v314] - 2025-07-18
 
 - JRuby 10.0.1.0 is now available
@@ -1731,7 +1736,8 @@ Bugfixes:
 * Change gem detection to use lockfile parser
 * use `$RACK_ENV` when thin is detected for rack apps
 
-[unreleased]: https://github.com/heroku/heroku-buildpack-ruby/compare/v314...main
+[unreleased]: https://github.com/heroku/heroku-buildpack-ruby/compare/v315...main
+[v315]: https://github.com/heroku/heroku-buildpack-ruby/compare/v314...v315
 [v314]: https://github.com/heroku/heroku-buildpack-ruby/compare/v313...v314
 [v313]: https://github.com/heroku/heroku-buildpack-ruby/compare/v312...v313
 [v312]: https://github.com/heroku/heroku-buildpack-ruby/compare/v311...v312

lib/language_pack/version.rb

@@ -2,6 +2,6 @@
 
 module LanguagePack
   class LanguagePack::Base
-    BUILDPACK_VERSION = "v314"
+    BUILDPACK_VERSION = "v315"
   end
 end