chore: stop using heroku's cedar-14 stack
chore: stop using heroku's cedar-14 stack

https://devcenter.heroku.com/articles/upgrading-to-the-latest-stack
dkocich/osm-pt-ngx-leaflet,dkocich/osm-pt-ngx-leaflet,dkocich/osm-pt-ngx-leaflet