Pion webrtc/v4 (v4.2.11) requires Go 1.24+. Upstream datarhei was at
go 1.21.0. Bumping to go 1.24.0 pulls minor bumps across testify,
golang.org/x/{crypto,net,sync,sys,text,time,tools,mod}; vendor/ is
regenerated via 'go mod vendor' to reflect the new versions.
No application code changes; pure dep bump to unblock M1.