Wordpres core-update theme renames theme folder name

My first instinct upon reading this was that a WordPress Plugin may give you more control over this behaviour. Have you considered writing a plugin to pull and apply the updates?

A quick Google on the subject found this:

https://github.com/afragen/github-updater

Any use?

Likewise, reviewing their implementation may give you clues as to how to address your issue.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)