GOV.UK Frontend 5.13.0

[matthew-shaw]

Added

• Added support for GOV.UK Frontend v5.13.0
• Python 3.14 support

Changed

• Migrated from setup.py to pyproject.toml for packaging config
• Migrated from pip-tools to pipenv for dependency management
• Reduced test Docker image size from 1.28GB to 400MB (-69.5%)

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

[matthew-shaw]

Pipeline failing due to GHSA-4xh5-x5gv-qwph No fixed version available yet. Added an explicit ignore as the versions of Python in use are not affected, even though the version of pip is.