Install CA certificates in GitHub Actions workflow

Added installation of CA certificates in workflow.

Author: IanSudbery

.github/workflows/tests.yml

@@ -17,6 +17,11 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install CA Certificates
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ca-certificates
+          sudo update-ca-certificates
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip