Oh, six is a dep of a dep

Author: StanFromIreland

.github/workflows/update-lint-and-build.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get install -y gettext
-          pip install requests cogapp polib transifex-python sphinx-intl
+          pip install requests cogapp polib transifex-python sphinx-intl six
           curl -o- https://raw.githubusercontent.com/transifex/cli/master/install.sh | bash
         working-directory: /usr/local/bin
       - uses: actions/checkout@master