Update commit of dhall-gitlab-ci

On recent dhall versions this leads to an error due to a mismatched
hash.

See: https://github.com/bgamari/dhall-gitlab-ci/pull/14

deps/GitLabCi.dhall

-https://raw.githubusercontent.com/bgamari/dhall-gitlab-ci/7681adb4a935ad0aba2d5a4fd27653eaf91990a3/package.dhall
+https://raw.githubusercontent.com/bgamari/dhall-gitlab-ci/eaa32660c024b3205dc3a32da3d1990243d61870/package.dhall