fix: PHP 8.1 "Serialization of 'ReflectionMethod' is not allowed" #6136
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With 0925b50 there have been proper fixes for CI_Migration and CI_Xmlrpcs classes.
But for CI_Codeigniter the former is_callable check has been removed without any substitution.
This causes "Serialization of 'ReflectionMethod' is not allowed" errors in several cases, especially when running PHPUnit integration tests using @runInSeparateProcess Feature.
Please accept the same fix for CI_Codeigniter main class as well.