ci(integration): Update integration dependencies to be installable

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

build/integration/composer.json

@@ -1,10 +1,10 @@
 {
   "require-dev": {
-    "phpunit/phpunit": "~6.5",
-    "behat/behat": "~3.12.0",
-    "guzzlehttp/guzzle": "7.5.0",
+    "phpunit/phpunit": "^8.5",
+    "behat/behat": "^3.12.0",
+    "guzzlehttp/guzzle": "^7.6.0",
     "jarnaiz/behat-junit-formatter": "^1.3",
-    "sabre/dav": "4.4.0",
-    "symfony/event-dispatcher": "~5.3"
+    "sabre/dav": "^4.4.0",
+    "symfony/event-dispatcher": "^5.3"
   }
 }