Update to oik-unloader v0.4.0 for improved accessibility of the active-plugins shortcode.

Changes
oik-unloader v0.4.0 delivers previously unreleased changes in v0.3.2.
Changes in v0.4.0
| Change | Reference |
|---|---|
| Changed: Accessibility: Reconcile libs | bobbingwide/oik-unloader#15 |
| Changed: A11y – try adding aria-label attr to local implementation of icheckbox() | bobbingwide/oik-unloader#15 |
| Fixed: Corect load_dir_files() method | bobbingwide/oik-unloader#14 |
Changes in v0.3.2
| Change | Reference |
|---|---|
| Changed: Support PHP 8.4 | bobbingwide/oik-unloader#14 |
Tested
- Tested: With WordPress 6.9
- Tested: With PHP 8.3
- Tested: With PHPUnit 9.6
- Tested manually with PHP 8.4
