Refactor drop method in GrantedSlot struct

[shailendra-codes]

Refactor drop implementation to use async for granting next slot.

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[shailendra-codes]

Hi

[github-actions]

Hi @shailendra-codes, thanks for your interest in contributing!

This project requires that pull request authors are vouched, and you are not in the list of vouched users.

This PR will be closed automatically. See https://github.com/golemcloud/golem/blob/main/CONTRIBUTING.md for more details.

[shailendra-codes]

I have read the CLA Document and I hereby the CLA

[shailendra-codes]

recheck

[shailendra-codes]

"I have signed the CLA now. Please reopen this PR."

[shailendra-codes]

@vigoo Hi, I am contributing via issuHunt for the $200 bounty. Could you please vouch for me so that my PR can be reviewed and merged? I have already signed the CLA.