NOTE: PHP 8 Deprecation warnings fix in upstream Solarium

[tsterker]

The following deprecation warning will be fixed in solarium: solariumphp/solarium#1117

13 tests triggered 1 PHP deprecation:

1) /Users/tim.sterker/code/Solarium-Collection-Manager/vendor/solarium/solarium/src/Core/Query/Result/QueryType.php:101
Creation of dynamic property Solarium\QueryType\Server\Collections\Result\ClusterStatusResult::$cluster is deprecated