Prepare release v345 (#1705)

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

Author: heroku-linguist[bot]

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+
+## [v345] - 2026-01-26
+
 - Set `WEB_CONCURRENCY_SET_BY=heroku/ruby` if `WEB_CONCURRENCY` gets set in (deprecated) `SENSIBLE_DEFAULTS` mode (https://github.com/heroku/heroku-buildpack-ruby/pull/1700)
 - Default Node.js version now 24.13.0 (https://github.com/heroku/heroku-buildpack-ruby/pull/1704)
 - Fix yarn and nodejs version change warnings (https://github.com/heroku/heroku-buildpack-ruby/pull/1699)
@@ -1889,7 +1892,8 @@ 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/v344...main
+[unreleased]: https://github.com/heroku/heroku-buildpack-ruby/compare/v345...main
+[v345]: https://github.com/heroku/heroku-buildpack-ruby/compare/v344...v345
 [v344]: https://github.com/heroku/heroku-buildpack-ruby/compare/v343...v344
 [v343]: https://github.com/heroku/heroku-buildpack-ruby/compare/v342...v343
 [v342]: https://github.com/heroku/heroku-buildpack-ruby/compare/v341...v342