[BUG] TypeError in getRequest method

[sascha-hf]

On calling the getRequest method in ApacheSolrForTypo3\Solr\IndexQueue\AbstractIndexer.php a TypeError wasbeing thrown because the value of $GLOBALS['TYPO3_REQUEST'] was about to be returned which is not of type ServerRequest.
We were able to supress this behaviour by adding "$GLOBALS['TYPO3_REQUEST'] instanceof ServerRequest" in the condition.

The error first appeared in a TYPO3 V12 instance with Solr V12.1.1. We've updated TYPO3 and Solr up to V13 but the exception is still there when running the Solr indexer.

[dkd-kaehm]

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