chore: Prepare version 2.3.0

[fsbraun]

Description

Related resources

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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

Bump package version to 2.3.0 and update related documentation

Build:

• Update package version to 2.3.0

Documentation:

• Update CHANGELOG and README for the new version

[sourcery-ai]

Reviewer's Guide

This PR prepares the 2.3.0 release by updating the project version constant and refreshing release-related documentation.

File-Level Changes

Change	Details	Files
Bump project version to 2.3.0	Incremented version constant	djangocms_versioning/__init__.py
Update release documentation	Added or updated entries in CHANGELOG.rst for v2.3.0 Refreshed version references in README.rst	CHANGELOG.rst README.rst

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[sourcery-ai]

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

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 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 93.67%. Comparing base (a132204) to head (457f503).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #466      +/-   ##
==========================================
+ Coverage   90.55%   93.67%   +3.11%     
==========================================
  Files          72       75       +3     
  Lines        2732     2671      -61     
  Branches      322        0     -322     
==========================================
+ Hits         2474     2502      +28     
+ Misses        182      169      -13     
+ Partials       76        0      -76     

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