Update prefect version

[supermaxiste]

Currently we're using aynio 3.7.1 as a temporary fix for the version of prefect we're currently using (2.10.6). See this issue from the prefect repo.
To prevent issues stemming from deprecated functions and vulnerabilities, we should use at least prefect 2.12.0 which is compatible with the latest version of aynio. We should also check for conflicts with other dependencies.

[supermaxiste]

To clarify: with prefect 2.12.0 we would not need to specify aynio as a dependency anymore