Fix async code calling blocking sync code

[dekkers]

Changes

This fixes async functions calling blocking sync code. After spotting this in a code review, I checked and saw that we already did this incorrectly in a few other places. Async code should not call blocking sync code because that will block the whole async event loop.

QA notes

It is hard to verify that it was not correct before, because the only effect is that the code would block in a place where it shouldn't.

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Checklist for code reviewers:

Copy-paste the checklist from the docs/source/templates folder into your comment.

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Checklist for QA:

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[stephanie0x00]

Checklist for QA:

• I have checked out this branch, and successfully ran a fresh make reset.
• I confirmed that there are no unintended functional regressions in this branch:
  • I have managed to pass the onboarding flow
  • Objects and Findings are created properly
  • Tasks are created and completed properly
• I confirmed that the PR's advertised feature or hotfix works as intended.
• I checked the logs for errors and/or warnings and made issues where necessary

What works:

Looks good. Onboarding works, scanning works, findings are created.

What doesn't work:

n/a

Bug or feature?:

n/a