a11y: don't mark individual checkboxes as required (#41130)

wcs/qommon/form.py

@@ -1159,6 +1159,8 @@ class CheckboxesWidget(CompositeWidget):
             if self.options_with_attributes and option[-1].get('disabled'):
                 element_kwargs['disabled'] = 'disabled'
                 self.disabled_options.append(name)
+            # don't mark individual checkboxes as required
+            element_kwargs.pop('required', None)
 
             if value and key in value:
                 checked = True