Merge pull request #40 from sserbin/dependabot/composer/phpunit/phpunit-tw-9.5.21

Update phpunit/phpunit requirement from ^7.3||^8.2 to ^9.5.21

Author: sserbin

composer.json

@@ -23,7 +23,7 @@
         "composer/package-versions-deprecated": "1.11.99.5"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.3||^8.2",
+        "phpunit/phpunit": "^7.3||^8.2|^9.5",
         "squizlabs/php_codesniffer": "^3.3",
         "vimeo/psalm": "^4.7"
     },