Update Composer Dependencies to fix Fatal Error

[junaidbhura]

Description of the Change

This bumps up the platform to 7.4 - which is now the minimum supported version for WordPress as well: https://en-au.wordpress.org/about/requirements/

Closes #3615

How to test the Change

N/A - just updated a few dependencies.

Changelog Entry

Updated PHP version to 7.4

Credits

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[felipeelia]

Thanks for opening the PR @junaidbhura but unfortunately we can't update that yet.

As stated on that page you linked: WordPress also works with PHP 7.0+, and that was updated in WP 6.3, and ElasticPress minimum WP version is still 5.6. Also, our minimum PHP required version is 7.0.

That said, we are planning to update the minimum PHP version to 7.4 when we release ElasticPress 5.0 in the next few months. Until then we'll have to find an alternative solution to the problem outlined in #3615.

[felipeelia]

Closing in favor of #3668