Update dependency pusher/pusher-php-server to v3.4.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
pusher/pusher-php-server (source)	require	minor	3.3.1 -> 3.4.1

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Release Notes

pusher/pusher-http-php

### [`v3.4.1`](https://togithub.com/pusher/pusher-http-php/blob/master/CHANGELOG.md#​341-2019-03-18) [Compare Source](https://togithub.com/pusher/pusher-http-php/compare/v3.4.0...v3.4.1) [ADDED] Support for PHP 7.3. ### [`v3.4.0`](https://togithub.com/pusher/pusher-http-php/blob/master/CHANGELOG.md#​340-2019-03-11) [Compare Source](https://togithub.com/pusher/pusher-http-php/compare/v3.3.1...v3.4.0) [ADDED] `get_users_info` method.

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