Merge pull request renoki-co#54 from renoki-co/dependabot/composer/phpunit/phpunit-tw-9.5.21

Update phpunit/phpunit requirement from ^9.5.20 to ^9.5.21

Author: rennokki

composer.json

@@ -39,7 +39,7 @@
         "mockery/mockery": "^1.5",
         "orchestra/testbench": "^6.28|^7.0",
         "orchestra/testbench-core": "^6.28|^7.0",
-        "phpunit/phpunit": "^9.5.20"
+        "phpunit/phpunit": "^9.5.21"
     },
     "config": {
         "sort-packages": true