The error came from Codeinwp/themeisle-content-forms repo. We used an old version of mailerlite/mailerlite-api-v2-php-sdk package which was using an old version of php-http/discovery. I manage to update them and the issue should be fixed now.

###Testing instructions:

• Install this version of OrbitFox
• Install Elementor
• Create a new page and add those widgets to your page https://vertis.d.pr/diVjBa
• Check that everything works on PHP 7.4 and 8
• Install this plugin https://wordpress.org/plugins/wp-mail-smtp/ and check the slack messages, I've sent you some login credentials
• After you set up that plugin, try sending a message via the Contact form widget from elementor. You should receive a mail in your inbox.

Closes #747