In /etc/i3status.conf the DHCP pidfile is defined as "/var/run/dhclient*.pid". Please change it to "/var/run/dhcpcd*.pid" since dhcpcd is used by default if available. Reproducible: Always
Sorry but we just provide that conf as an example with more or less sane defaults, strictly following upstream. If you want to customize it, just do it in ${HOME}/.i3status.conf. You can always file a bug upstream.