Bump slim/slim from 4.15.1 to 4.15.2

Bumps [slim/slim](https://github.com/slimphp/Slim) from 4.15.1 to 4.15.2.
- [Release notes](https://github.com/slimphp/Slim/releases)
- [Changelog](https://github.com/slimphp/Slim/blob/4.x/CHANGELOG.md)
- [Commits](slimphp/Slim@4.15.1...4.15.2)

---
updated-dependencies:
- dependency-name: slim/slim
  dependency-version: 4.15.2
  dependency-type: indirect
...

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Author: dependabot[bot]