d/librem5-ci.yml: Use byzantium

5 jobs for pureos/byzantium in 3 minutes and 6 seconds (queued for 1 second)
Status Job ID Name Coverage
  Package
passed #368527
librem5
package-pureos-byzantium

00:01:07

passed #368528
librem5:arm64
package-pureos-byzantium:arm64

00:03:05

 
  Test Package
passed #368529
librem5
autopkgtest-pureos-byzantium-package

00:00:59

passed #368531
librem5
check-tarball

00:00:40

passed #368530
librem5
lintian-pureos-byzantium-package

00:00:50