build: bump solarium version

Author: oantonelli

composer.json

@@ -12,7 +12,7 @@
   },
   "require": {
     "php": "^7",
-    "solarium/solarium": "^4",
+    "solarium/solarium": "^5",
     "php-http/httplug": "^1",
     "php-http/promise": "^1",
     "php-http/guzzle6-adapter": "^1",