Prepare release v308 (#1473)

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]
 
+
+## [v308] - 2025-08-29
+
 - Added Node.js 24.7.0 (linux-amd64)
 - Added Node.js 22.19.0 (linux-amd64)
 
@@ -1130,7 +1133,8 @@ 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/v307...main
+[unreleased]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v308...main
+[v308]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v307...v308
 [v307]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v306...v307
 [v305]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v304...v305
 [v304]: https://github.com/heroku/heroku-buildpack-nodejs/compare/v303...v304