docs: Update CHANGELOG to clarify Python 2 support
What does this MR do?
The minor version bump actually drops support for Python 2. That's a significant enough change that IMO it merits a changelog entry.
In retrospect, this should probably have been a minor version bump if we had noticed but given it's already released we can keep as-is and document to raise visibility.
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
- [-] Changelog entry added
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Documentation created/updated for GitLab EE, if necessary -
Documentation created/updated for this project, if necessary -
Documentation reviewed by technical writer or follow-up review issue created -
Tests added for this feature/bug -
Job definition updated, if necessary -
Conforms to the code review guidelines -
Conforms to the Go guidelines -
Security reports checked/validated by reviewer