gitlab-ci: Bump Docker images
gitlab-ci: Bump Docker images

Installs pxz on Centos7

(cherry picked from commit 86960e691f7a600be247c32a7cf795bf9abf7cc4)

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc