Rapyd-db

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- pymongo 4+ no longer executes operations after `MongoClient`` is closed.
As a result, the `Mongo` backend will now return a `list` from the context
manager to prevent the following error:

pymongo.errors.InvalidOperation: Cannot use MongoClient after close


- https://pymongo.readthedocs.io/en/stable/migrate-to-pymongo4.html#mongoclient-cannot-execute-operations-after-close

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- Switched from using `_last_executed` to `_executed` private member in
MySQL / MariaDB backend as `mysqlclient` dropped `_last_executed` as part of:

- https://github.com/PyMySQL/mysqlclient/blob/master/HISTORY.rst#whats-new-in-1314
- https://github.com/PyMySQL/mysqlclient/pull/283