fix: cleanup found action to prevent zombie processes

[arjun-1]

I'm encountering a lot of <defunct> curl processes when running Dalfox with --found-action. The eventual cause my system to crash as they are not cleaned up. This fix cleans up the process resource

[hahwul]

Hi @arjun-1
Oh, thank you so much! I'll go ahead and merge it. This will be included in the next version, and I'll make sure to release it as soon as possible. Have a great day! :)