Update Starlette, FastAPI and Django

[dekkers]

Changes

Fixes security issues in Starlette and Django. FastAPI is also updated to the next minor version because Starlette can't be updated without updating FastAPI.

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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:

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

[underdarknl]

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.

What works:

Everything seems to work, from onboarding to reports, tasklists etc.