test: Need moar ldap apt deps

.github/workflows/tox.yml

@@ -5,12 +5,11 @@ on:
   - pull_request
 
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: [3.7, 3.9]
-
     steps:
     - uses: actions/checkout@v1
     - name: Set up Python ${{ matrix.python-version }}
@@ -18,7 +17,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install apt dependencies
-      run: sudo apt install ldap-utils slapd
+      run: sudo apt install ldap-utils slapd libsasl2-dev libldap2-dev libssl-dev
     - name: Install tox
       run: |
         python -m pip install --upgrade pip