fix(b-form-checkbox): `change` event value when in multiple mode (closes #5697)#5716

jacobmllr95 merged 4 commits intodevbootstrap-vue/bootstrap-vue:devfrom

fix-b-form-checkbox-multiple-change-event-valuebootstrap-vue/bootstrap-vue:fix-b-form-checkbox-multiple-change-event-valueCopy head branch name to clipboard