Bump laravel/framework from 5.8.38 to 6.20.42

Bumps [laravel/framework](https://github.com/laravel/framework) from 5.8.38 to 6.20.42.
- [Release notes](https://github.com/laravel/framework/releases)
- [Changelog](https://github.com/laravel/framework/blob/9.x/CHANGELOG.md)
- [Commits](laravel/framework@v5.8.38...v6.20.42)

---
updated-dependencies:
- dependency-name: laravel/framework
  dependency-type: direct:production
...

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

composer.json

@@ -10,7 +10,7 @@
     "require": {
         "php": "^7.1.3",
         "fideloper/proxy": "^4.0",
-        "laravel/framework": "5.8.*",
+        "laravel/framework": "6.20.*",
         "laravel/tinker": "^1.0",
         "tymon/jwt-auth": "^1.0"
     },