Release v0.84.0

[MichaelFu512]

Pull Request Description

v0.84.0 Jun. 4, 2024

Enhancements

• Reformatted files with updated black version #4395

  Fixes

  Changes

• Dropped support for Python 3.8 #4414
• Removed vowpalwabbit #4427
• Uncapped holidays #4428
• Unpinned kaleido #4423
• Unpinned shap and scipy #4436
• Unpinned most pinned dependencies under project.optional-dependencies #4431

  Documentation Changes

  Testing Changes

• Added ability to run airflow tests in Python 3.9 #4391
• Removed iterative test from airflow runs #4424
• Updated GH actions to improve handling of potentially unsafe variables #4417
• Fixed install test #4423

  Breaking Changes

• Dropped support for Python 3.8 #4414
• Removed vowpalwabbit #4427

---

After creating the pull request: in order to pass the release_notes_updated check you will need to update the "Future Release" section of docs/source/release_notes.rst to include this pull request by adding :pr:123.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.7%. Comparing base (46ccfd1) to head (22b760f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4443 +/- ## ===================================== Coverage 99.7% 99.7% ===================================== Files 352 352 Lines 40041 40041 ===================================== Hits 39920 39920 Misses 121 121 ```

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