config: bump equalsverifier version to 2.2.1
config: bump equalsverifier version to 2.2.1

sirdis/checkstyle,jonmbake/checkstyle,jochenvdv/checkstyle,romani/checkstyle,ilanKeshet/checkstyle,izishared/checkstyle,checkstyle/checkstyle,bansalayush/checkstyle,rnveach/checkstyle,AkshitaKukreja30/checkstyle,MEZk/checkstyle,MEZk/checkstyle,izishared/checkstyle,jochenvdv/checkstyle,jonmbake/checkstyle,sharang108/checkstyle,izishared/checkstyle,jochenvdv/checkstyle,romani/checkstyle,nikhilgupta23/checkstyle,romani/checkstyle,checkstyle/checkstyle,nikhilgupta23/checkstyle,nikhilgupta23/checkstyle,ilanKeshet/checkstyle,AkshitaKukreja30/checkstyle,ilanKeshet/checkstyle,bansalayush/checkstyle,romani/checkstyle,sharang108/checkstyle,checkstyle/checkstyle,liscju/checkstyle,sabaka/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,bansalayush/checkstyle,liscju/checkstyle,checkstyle/checkstyle,rnveach/checkstyle,rnveach/checkstyle,jonmbake/checkstyle,romani/checkstyle,AkshitaKukreja30/checkstyle,sabaka/checkstyle,MEZk/checkstyle,liscju/checkstyle,sabaka/checkstyle,sirdis/checkstyle,rnveach/checkstyle,rnveach/checkstyle,romani/checkstyle,checkstyle/checkstyle,sirdis/checkstyle,sharang108/checkstyle