build(ci4): update CodeIgniter to v4.3.6

app/Common.php

app/Config/App.php

app/Config/Autoload.php

app/Config/Database.php

app/Config/DocTypes.php

app/Config/Email.php

app/Config/Encryption.php

app/Config/Exceptions.php

app/Config/Generators.php

app/Config/Honeypot.php

app/Config/Kint.php

app/Config/Logger.php

app/Config/Mimes.php

app/Config/Modules.php

app/Config/Pager.php

app/Config/Routes.php

app/Config/Security.php

app/Config/Session.php

app/Config/Validation.php

app/Controllers/BaseController.php