Update to oik v4.12.1 for a security improvement to the oik plugins delete plugin action.

Changes
| Change | Reference |
|---|---|
| Changed: Protect oik plugins delete_plugin action with nonce. Props: Patchstack, Vulnerability Researcher: Abdi Pranata | bobbingwide/oik#230 |
Tested
- Tested: With WordPress 6.6.1 and WordPress Multisite
- Tested: With PHP 8.3
- Tested: With PHPUnit 9.6
