Fix broken url
Fix broken url

As per https://github.com/sgerrand/alpine-pkg-glibc#please-note.

Signed-off-by: David Rodríguez <96558bf9378c437d3852fad4fa4b4bd63aeb6eda@riseup.net>

thaJeztah/compose,vdemeester/compose,thaJeztah/compose,vdemeester/compose