PHP 8.2 and WP 6.4 compatibility fixes

[eri-trabiccolo]

Description

Fix all PHP 8.2 and WP 6.4 compatibility issues. still some deprecation warnings to fix.

How has this been tested?

manually and unit tests

Screenshots

Types of changes

enhancement

Checklist:

• [x] This PR requires and contains at least one changelog file. <!-- To create a changelog yml file: npm run dev changelog add -- -i and follow the prompt. See also: https://github.com/gocodebox/lifterlms/blob/trunk/packages/dev/README.md#changelog-add -->
• [x] My code has been tested.
• [x] My code passes all existing automated tests.
• [x] My code follows the LifterLMS Coding & Documentation Standards.