Cache is not invalidated properly when adding a decorated method to a cached aspect

[HighLiuk]

If you add a (decorated) method on an aspect which is already cached, the cache is not invalidated and the method is not run.

Steps to reproduce:

src/Bar.php

namespace App;

class Bar
{
    public function bar(): void
    {
        echo "bar\n";
    }
}

src/Aop/MyAspect.php

namespace App\Aop;

use App\Bar;
use Okapi\Aop\Attributes\After;
use Okapi\Aop\Attributes\Around;
use Okapi\Aop\Attributes\Aspect;

#[Aspect]
class MyAspect
{
    #[Around(Bar::class, 'bar')]
    public function foo(): void
    {
        echo "foo\n";
    }

    // #[After(Bar::class, 'bar')]
    // public function baz(): void
    // {
    //     echo "baz\n";
    // }
}

src/Aop/Kernel.php

namespace App\Aop;

use Okapi\Aop\AopKernel;

class Kernel extends AopKernel
{
    protected array $aspects = [
        MyAspect::class,
    ];   
}

main.php

use App\Aop\Kernel;

require_once __DIR__ . '/vendor/autoload.php';

Kernel::init();

$bar = new App\Bar();
$bar->bar();

If you run rm -rf cache && php main.php this is the output as expected: foo bar. If you then uncomment the baz method and run php main.php again, the output is still foo bar, but if you run rm -rf cache && php main.php again, you'll get the correct foo bar baz output.

May this be related with #61? If that's the case, the contents hash or filemtime should be used as key for invalidating, probably.