task: #3564209 Update mailgun library to 4.x for PHP 8.4 compatibility.

James Oakleyrequested to merge
issue/mailgun-3564209:3564209-php-8.4-errors into 2.2.x

task: #3564209 Update mailgun library to 4.x for PHP 8.4 compatibility.

By: jamesoakley By: johnpicozzi By: aaronbauman By: ben.hamelin By: usingsession By: bohart

Edited by Bohdan Artemchuk

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