Add new tag v6.2.1 with renaming of MaxAggregation.php class

[khandurdyiev]

Latest version of tag v6.2.0 doesn't exists renaming of MaxAggregation.php class. So this blocks updating to composer v2.

Diff between v6.2.0 tag with 6.2 branch

Please add new tag which includes renaming of MaxAggregation.php class