Prepare release v288 (#1394)

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]
 
+
+## [v288] - 2025-03-28
+
 - Added Node.js version 18.20.8.
 
 ## [v287] - 2025-03-14
@@ -1029,7 +1032,8 @@ Accepts `cacheDirectories` array in package.json to override default `node_modul
 
 - Documented at https://devcenter.heroku.com/articles/nodejs-support#cache-behavior
 
-[unreleased]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v287...main
+[unreleased]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v288...main
+[v288]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v287...v288
 [v287]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v286...v287
 [v286]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v285...v286
 [v285]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v284...v285