Update to oik-dates v0.3.0 for support for PHP 8.3 and PHP 8.4

Changes
| Change | Reference |
|---|---|
| Changed: Call strtotime() rather than bw_date_adjust() to adjust the meta_value | bobbingwide/oik-dates#3 |
| Changed: Support PHP 8.4’s str_getcsv() change | bobbingwide/oik-dates#2 |
| Changed: Pass now rather than null to bw_date_adjust | bobbingwide/oik-dates#2 |
Tested
- Tested: With WordPress 6.7.1 and WordPress Multisite
- Tested: With PHP 8.3 and PHP 8.4
- Tested: With PHPUnit 9.6
