Remove commented credentials from publish-docs

This job is now only added for public repos, so there is no need to
pass credentials.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

cookiecutter/{{cookiecutter.github_repo_name}}/.github/workflows/ci.yaml

@@ -273,10 +273,6 @@ jobs:
     steps:
       - name: Setup Git
         uses: frequenz-floss/gh-action-setup-git@16952aac3ccc01d27412fe0dea3ea946530dcace # v1.0.0
-        # TODO(cookiecutter): Uncomment this for projects with private dependencies
-        # with:
-        #   username: ${{ secrets.GIT_USER }}
-        #   password: ${{ secrets.GIT_PASS }}
 
       - name: Fetch sources
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2