Bumped php unit to 9.4.

Signed-off-by: Johannes Tegnér <johannes@jitesoft.com>

Author: Johannestegner

composer.json

@@ -21,7 +21,7 @@
         "psr/http-client": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "9.3.*",
+        "phpunit/phpunit": "9.4.*",
         "squizlabs/php_codesniffer": "3.5.*"
     },
     "autoload": {