Us an explicit version of sabre/dav to allow caching on the jenkins slaves - fixes #25087 (#25088)

build/integration/composer.json

@@ -4,6 +4,6 @@
     "behat/behat": "^3.0",
     "guzzlehttp/guzzle": "~5.0",
     "jarnaiz/behat-junit-formatter": "^1.3",
-    "sabre/dav": "3.0.x-dev"
+    "sabre/dav": "3.0.9"
   }
 }