Update franzl/whoops-middleware requirement from ^1.1 to ^2.0

Updates the requirements on [franzl/whoops-middleware](https://github.com/franzliedke/whoops-middleware) to permit the latest version.
- [Release notes](https://github.com/franzliedke/whoops-middleware/releases)
- [Commits](franzliedke/whoops-middleware@1.1.0...2.0.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -31,7 +31,7 @@
     "wshafer/psr11-monolog": "^3.0.0|@dev"
   },
   "require-dev": {
-    "franzl/whoops-middleware": "^1.1",
+    "franzl/whoops-middleware": "^2.0",
     "phpro/grumphp": "^1.0",
     "phpstan/phpstan": "^0.12",
     "phpunit/phpunit": "^8.0|^9.0",