fix: Remove reference to sunset LooseVersion of distutils

[fsbraun]

Description

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Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

Summary by Sourcery

Enhancements:

• Drop LooseVersion import and DJANGO_2_2 flag from utils and fields modules

[sourcery-ai]

Reviewer's Guide

The PR eliminates the deprecated distutils.LooseVersion import and associated DJANGO_2_2 compatibility flag, cleaning up unused code across the utils and fields modules.

Class diagram for removal of DJANGO_2_2 and LooseVersion references

classDiagram
    class utils {
        - DJANGO_VERSION : str
        - PYTHON_VERSION : str
    }
    %% Note: DJANGO_2_2 and LooseVersion have been removed from utils

    class fields {
        +regex_key_validator
        %% No longer imports DJANGO_2_2 from utils
    }
    utils <.. fields : import (DJANGO_2_2 removed)

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File-Level Changes

Change	Details	Files
Remove distutils.LooseVersion usage and DJANGO_2_2 constant	Deleted import of LooseVersion Removed DJANGO_2_2 computation and related comments	djangocms_attributes_field/utils.py
Drop unused DJANGO_2_2 import in fields module	Removed import of DJANGO_2_2 from utils	djangocms_attributes_field/fields.py

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[sourcery-ai]

Hey @fsbraun - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.13%. Comparing base (41d95f8) to head (ffe6bf0).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
- Coverage   91.44%   89.13%   -2.32%     
==========================================
  Files           4        4              
  Lines         187      184       -3     
  Branches       29       29              
==========================================
- Hits          171      164       -7     
- Misses         10       14       +4     
  Partials        6        6              

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