Add PHP 8.3 to test matrix (#245)

* Add PHP 8.3 to test matrix
* Update psalm for 8.3 to work
* Update psalm suppressions
* Fix php-cs-fixer issue

Author: agoallikmaa

composer.json

@@ -26,9 +26,9 @@
     "phan/phan": "^5.0",
     "phpstan/phpstan": "^1.1",
     "phpstan/phpstan-phpunit": "^1.0",
-    "psalm/plugin-phpunit": "^0.16",
+    "psalm/plugin-phpunit": "^0.18.4",
     "phpunit/phpunit": "^9.5",
-    "vimeo/psalm": "^4.0",
+    "vimeo/psalm": "^5.0",
     "symfony/http-client": "^5.4|^6.0",
     "guzzlehttp/promises": "^1.5",
     "php-http/message-factory": "^1.0",