Update to phpunit 9.5

Author: pprkut

composer.json

@@ -28,7 +28,7 @@
 		}
 	],
 	"require": {
-		"php": ">=5.6.0",
+		"php": ">=7.3.0",
 		"colinmollenhour/credis": "~1.7",
 		"psr/log": ">=1.1.0"
 	},
@@ -38,7 +38,7 @@
 		"ext-redis": "Native PHP extension for Redis connectivity. Credis will automatically utilize when available."
 	},
 	"require-dev": {
-		"phpunit/phpunit": "^8.5",
+		"phpunit/phpunit": ">=9.0 <9.6",
 		"squizlabs/php_codesniffer": "^3.10",
 		"phpstan/phpstan": "^1.12"
 	},