🧪 Use reusable-tox.yml @ tox-dev/workflow

[webknjaz]

❓ What kind of change does this PR introduce?

• 🐞 bug fix
• 🐣 feature
• 📋 docs update
• 📋 tests/coverage improvement
• 📋 refactoring
• 💥 other

📋 What is the related issue number (starting with #)

N/A

❓ What is the current behavior? (You can also link to an open issue here)

Copy-pasted CI setup

❓ What is the new behavior (if this is a feature change)?

The tox-centric job reused and defined externally.

📋 Other information:

https://github.com/tox-dev/workflow

📋 Contribution checklist:

(If you're a first-timer, check out
this guide on making great pull requests)

• I wrote descriptive pull request text above
• I think the code is well written
• I wrote good commit messages
• I have squashed related commits together after
  the changes have been approved
• Unit tests for the changes exist
• Integration tests for the changes exist (if applicable)
• I used the same coding conventions as the rest of the project
• The new code doesn't generate linter offenses
• Documentation reflects the changes
• The PR relates to only one subject with a clear title
  and description in grammatically correct, complete sentences

---

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.61%. Comparing base (173a630) to head (3fb6a1c).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #743      +/-   ##
==========================================
+ Coverage   82.81%   83.61%   +0.79%     
==========================================
  Files          38       28      -10     
  Lines        4208     4168      -40     
==========================================
  Hits         3485     3485              
+ Misses        723      683      -40