Fix Docker in Docker CI jobs (#5867)

.gitlab-ci.yml

@@ -10,7 +10,6 @@ stages:
 variables:
   FAILFASTCI_NAMESPACE: 'kargo-ci'
   GITLAB_REPOSITORY: 'kargo-ci/kubernetes-sigs-kubespray'
-  # DOCKER_HOST: tcp://localhost:2375
   ANSIBLE_FORCE_COLOR: "true"
   MAGIC: "ci check this"
   TEST_ID: "$CI_PIPELINE_ID-$CI_BUILD_ID"
@@ -45,8 +44,6 @@ before_script:
 
 .testcases: &testcases
   <<: *job
-  services:
-    - docker:dind
   before_script:
     - update-alternatives --install /usr/bin/python python /usr/bin/python3 1
     - ./tests/scripts/rebase.sh