Symphony 4.3 Dependency Fix for Symfony\Component\EventDispatcher\EventDispatcherInterface::dispatch()

[scarl555]

described here: https://github.com/graphaware/neo4j-php-client/issues/159

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[graphaware-bot]

Dear @scarl555,

thank you very much for your Github contributions to GraphAware's
software. In order for us to be able to accept and keep your
contributions, we would like to ask you to download, fill in, sign, and send us
a photo / scanned copy of the attached Contributor License Agreement to [email protected] .

Thank you very much in advance,

Kind Regards,

The GraphAware Team