Version 2.7.4

• Improve the behaviour of bold_labels in radio button collections. Since the beginning the behaviour has been to flip the default to bold labels when the :description is present, as it adds hints per option and they can blend into the labels. This approach didn't allow bold labels to be turned off when not wanted, so here we're changing the default from false to nil. When nil, the old behaviour continues but when set to either true or false the setting will take precedence. Thanks @fofr for identifying and raising this. #316
• Upgrade to version 3.13.1 of the design system #314