FIX: update tornado version to 6.3.3

[dfsp-spirit]

Changes Summary

• re-gerenerate poetry.lock via poetry update, mainly to update tornado to 6.3.3

Reviewer Checklist

• [ ] Are testing routines present?
• [ ] Do objects in the global package namespace perform proper parsing of their input?
• [ ] Are all docstrings complete and accurate?
• [ ] Is the CHANGELOG.md up to date?

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -0.08% :warning:

Comparison is base (86234a8) 69.31% compared to head (ca2b8d1) 69.23%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #567 +/- ## ========================================== - Coverage 69.31% 69.23% -0.08% ========================================== Files 87 87 Lines 10123 10123 Branches 2125 2125 ========================================== - Hits 7017 7009 -8 - Misses 2533 2537 +4 - Partials 573 577 +4 ``` [see 4 files with indirect coverage changes](https://app.codecov.io/gh/esi-neuroscience/syncopy/pull/567/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=esi-neuroscience)

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