fix: Mirroring test

Author: adintegra

.github/workflows/gitlab-mirror-test.yml

@@ -22,7 +22,6 @@ jobs:
         uses: wearerequired/git-mirror-action@v1
         env:
           SSH_PRIVATE_KEY: ${{ secrets.GITLAB_TEST_PKEY }}
-          SSH_KNOWN_HOSTS: ${{ secrets.GITLAB_TEST_HOSTS }}
         with:
           source-repo: "git@github.com:visualize-admin/visualization-tool.git"
           destination-repo: "git@gitlab.ldbar.ch:interactivethings/visualize-mirroring-test.git"