fixup! renovate.json: group dependencies together to reduce noise
fixup! renovate.json: group dependencies together to reduce noise

Only group linters and docker images

ecamp/ecamp3,pmattmann/ecamp3,pmattmann/ecamp3,pmattmann/ecamp3,usu/ecamp3,ecamp/ecamp3,usu/ecamp3,ecamp/ecamp3,pmattmann/ecamp3,usu/ecamp3,ecamp/ecamp3,usu/ecamp3