CI: Upgrade dependencies to needs

Run jobs greedily rather than relying on staging.
https://docs.gitlab.com/ee/ci/yaml/#needs

.gitlab-ci.yml

@@ -196,7 +196,7 @@ update-repo:
     - nix run -f ci/default.nix -c build-repo.sh extract-keys
     - nix run -f ci/default.nix -c build-repo.sh build-repo
 
-  dependencies:
+  needs:
     - build-master
 
   after_script:
@@ -214,7 +214,7 @@ pages:
   image: "nixos/nix:$DOCKER_TAG"
   script:
     - mv repo public
-  dependencies:
+  needs:
     - update-repo
   rules:
     - if: '$CI_COMMIT_BRANCH == "master"'