Revert "Remove Composer dev dependencies apis-guru/openapi-directory,…

… nexmo/api-specification temporarily for work-around for cebe#209 and cebe#210"

This reverts commit 27e2618.

composer.json

@@ -28,6 +28,8 @@
 		"phpunit/phpunit": "^6.5 || ^7.5 || ^8.5 || ^9.4",
 		"oai/openapi-specification": "3.0.3",
 		"mermade/openapi3-examples": "1.0.0",
+		"apis-guru/openapi-directory": "1.0.0",
+		"nexmo/api-specification": "1.0.0",
 		"phpstan/phpstan": "^0.12.0"
 	},
 	"conflict": {