[TASK] Update solr version to v6.6.2
According to https://raw.githubusercontent.com/TYPO3-Solr/ext-solr/master/Documentation/Appendix/VersionMatrix.rst ext:solr v7.5.0 requires solr v6.6.2.
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According to https://raw.githubusercontent.com/TYPO3-Solr/ext-solr/master/Documentation/Appendix/VersionMatrix.rst ext:solr v7.5.0 requires solr v6.6.2.