Merge pull request #88 from PhpGt/hard-dependencies

build: hard dependencies

Author: Greg Bowler

composer.json

@@ -8,8 +8,8 @@
 		"psr/container": "^2.0.1"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "9.*",
-		"phpstan/phpstan": "1.4.*"
+		"phpstan/phpstan": "v1.8.0",
+		"phpunit/phpunit": "v9.5.21"
 	},
 
 	"provide": {