tests: pin tenacity to <8.4

[tonyandrewmeyer]

Issue

Unit tests fail with tenacity 8.4.

Solution

Pin tenacity to < 8.4. I assume you'll want to figure out how to use 8.4 and adjust the tests appropriately, but for now this makes relocking work.

Fixes #468.

[dimaqq]

Same comment as here: canonical/mysql-k8s-operator#443 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.54%. Comparing base (e7c1809) to head (eebc7f8).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #469      +/-   ##
==========================================
+ Coverage   66.25%   66.54%   +0.28%     
==========================================
  Files          17       18       +1     
  Lines        3180     3871     +691     
  Branches      424      537     +113     
==========================================
+ Hits         2107     2576     +469     
- Misses        935     1109     +174     
- Partials      138      186      +48     

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[carlcsaposs-canonical]

closing since canonical/operator#1272 fixed (canonical/mysql-k8s-operator#442 (comment))

will address when updating tenacity in poetry.lock