Use require-dev instead of conflicts

Author: Grzegorz Korba

composer.json

@@ -18,7 +18,6 @@
     "phpstan/phpstan": "^1.4"
   },
   "conflict": {
-    "psr/container": "1.1.2",
     "symfony/framework-bundle": "<3.0"
   },
   "require-dev": {
@@ -27,6 +26,7 @@
     "phpstan/phpstan-phpunit": "^1.0",
     "phpstan/phpstan-strict-rules": "^1.0",
     "phpunit/phpunit": "^9.5",
+    "psr/container": "^1.1 <1.1.2",
     "symfony/config": "^4.2 || ^5.0",
     "symfony/console": "^4.0 || ^5.0",
     "symfony/dependency-injection": "^4.0 || ^5.0",