This update corrects a bug in the Sendcloud delivery service that was preventing accurate data retrieval. The original code incorrectly sliced a list, leading to an error when attempting to access the first element. The fix ensures the correct data is retrieved, improving the reliability of delivery tracking.

Slicing in Python returns a sub-list, even for a single element. Doing `res[:1]` does not return the first element so doing `.get` causes an error.

This was not caught because the tests do not run in CI due to the tags on the class.

Forward-Port-Of: odoo/enterprise#111254