Update action.yml

This may work to fix some of the issues you're seeing

.github/actions/setup-backend/action.yml

@@ -22,6 +22,9 @@ runs:
       with:
         python-version: ${{ inputs.python-version }}
         cache: ${{ inputs.cache }}
+    - name: apt-get deps
+      shell: bash
+      run: sudo apt-get install -y libldap2-dev libsasl2-dev
     - name: Install dependencies
       run: |
         pip install --upgrade pip setuptools wheel