chore: Move phpunit in composer bin

Signed-off-by: Louis Chemineau <louis@chmn.me>

composer.json

@@ -35,8 +35,7 @@
 		]
 	},
 	"require-dev": {
-		"bamarni/composer-bin-plugin": "^1.8",
-		"phpunit/phpunit": "^9.5"
+		"bamarni/composer-bin-plugin": "^1.8"
 	},
 	"extra": {
 		"bamarni-bin": {
@@ -44,4 +43,4 @@
 			"forward-command": false
 		}
 	}
-}
+}

vendor-bin/phpunit/composer.json

@@ -0,0 +1,5 @@
+{
+    "require-dev": {
+        "phpunit/phpunit": "^9"
+    }
+}