fix: cached query_settings

[Daesgar]

For some reason (I lack knowledge of celery / Django, there must be an explanation for this), the query_settings were being cached.

This meant that, when a base backup was executed after an incremental backup, the base backup was taking the last query_settings used, so when the base backup was performed it was using the previous base backup cached in the query settings from the last execution. It could even be a base backup for a different table.

The base backup should never use a previous base backup.

This fixes the issue, but I'll keep monitoring it for the next following backups performed.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: housewatch/clickhouse/backups.py

Function	Unhandled Issue
execute_backup	UnboundLocalError: local variable 'final_query' referenced before assignment ... Event Count: 2
execute_backup	TypeError: str.join() takes no keyword arguments ... Event Count: 2

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[Daesgar]

@fuziontech I'm merging this, it's a very small change. Anyway, if you review it and see any problems let me know!