fix(spell): bump spell to 0.5.17 and fix tests

[justprosh]

Description

Spell Mailbox API has changed, and some tests should be updated

Motivation

Related Issue(s)

• depends on feat(mailbox): store and return init_peer_id and timestamp [NET-510] spell#154

Proposed Changes

Screenshots (if applicable)

Additional Notes

Checklist

• The code follows the project's coding conventions and style guidelines.
• All tests related to the changes have passed successfully.
• Documentation has been updated to reflect the changes (if applicable).
• All new and existing unit tests have passed.
• I have self-reviewed my code and ensured its quality.
• I have added/updated necessary comments to aid understanding.

Reviewer Checklist

• Code has been reviewed for quality and adherence to guidelines.
• Tests have been reviewed and are sufficient to validate the changes.
• Documentation has been reviewed and is up to date.
• Any questions or concerns have been addressed.