revert: Add back some upper Python version constraints in dependencies

[edgarrmondragon]

This reverts commit 7529cbf.

Causing issues for Poetry-managed downstream packages: https://github.com/meltano/sdk/actions/runs/13075031342/job/36484997547?pr=2857

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request reverts a previous commit that introduced upper version constraints on some dependencies. The constraints have been removed, allowing for more flexibility in dependency management.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Removed upper Python version constraints from the 'backoff' and 'duckdb-engine' dependencies.	Removed the python_version<"4" constraint from the backoff dependency. Removed the python_version<'4' constraint from the duckdb-engine dependency.	pyproject.toml

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[sourcery-ai]

Hey @edgarrmondragon - I've reviewed your changes - here's some feedback:

Overall Comments:

• Adding Python 4 version constraints seems premature since Python 4 doesn't exist yet. Consider keeping the more permissive version constraints from the previous commit unless there's a specific compatibility concern.
• There appears to be a typo in the flake8-datetimez comment (changed to 'datetimezs')

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.34%. Comparing base (7529cbf) to head (edb9826).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2858   +/-   ##
=======================================
  Coverage   91.34%   91.34%           
=======================================
  Files          62       62           
  Lines        5209     5209           
  Branches      673      673           
=======================================
  Hits         4758     4758           
  Misses        319      319           
  Partials      132      132           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[codspeed-hq]

CodSpeed Performance Report

Merging #2858 will not alter performance

_{Comparing revert-2856 (edb9826) with main (7529cbf)}

Summary

✅ 7 untouched benchmarks