Bump league/container from 3.4.1 to 4.2.1

Bumps [league/container](https://github.com/thephpleague/container) from 3.4.1 to 4.2.1.
- [Release notes](https://github.com/thephpleague/container/releases)
- [Changelog](https://github.com/thephpleague/container/blob/4.x/CHANGELOG.md)
- [Commits](thephpleague/container@3.4.1...4.2.1)

---
updated-dependencies:
- dependency-name: league/container
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -15,7 +15,7 @@
         "filp/whoops": "^2.5",
         "guzzlehttp/psr7": "^1.3",
         "hassankhan/config": "^2.1",
-        "league/container": "^3.3",
+        "league/container": "^4.2",
         "league/route": "^4.3",
         "monolog/monolog": "^1.11",
         "slim/psr7": "^1.4",