Prepare release v5.5.8 (#1362)

## heroku/nodejs

### Added

- 24.15.0 (linux-amd64, linux-arm64)

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

Author: heroku-linguist[bot]

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [5.5.8] - 2026-04-16
+
 ### Added
 
 - 24.15.0 (linux-amd64, linux-arm64)
@@ -270,7 +272,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Dropped provides for `node`, `npm`, `pnpm`, `yarn`, `node_modules`, and `node_build_scripts`. ([#1169](https://github.com/heroku/buildpacks-nodejs/pull/1169))
 - Requires `heroku/nodejs` if `package.json`, `index.js`, or `server.js` is detected. ([#1169](https://github.com/heroku/buildpacks-nodejs/pull/1169))
 
-[unreleased]: https://github.com/heroku/buildpacks-nodejs/compare/v5.5.7...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-nodejs/compare/v5.5.8...HEAD
+[5.5.8]: https://github.com/heroku/buildpacks-nodejs/compare/v5.5.7...v5.5.8
 [5.5.7]: https://github.com/heroku/buildpacks-nodejs/compare/v5.5.6...v5.5.7
 [5.5.6]: https://github.com/heroku/buildpacks-nodejs/compare/v5.5.5...v5.5.6
 [5.5.5]: https://github.com/heroku/buildpacks-nodejs/compare/v5.5.4...v5.5.5

buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/nodejs"
-version = "5.5.7"
+version = "5.5.8"
 name = "Heroku Node.js"
 homepage = "https://github.com/heroku/buildpacks-nodejs"
 description = "Heroku's buildpack for Node.js applications."