Add a certificate to the requests done in pull_gcc_layers DAG

[tahaislam]

Need to add a certificate (on VFH servers) to our requests that pulls the GIS layers to resolve the below warning

[2023-12-22, 11:54:00 EST] {logging_mixin.py:154} WARNING - /home/airflow/airflow_venv/lib64/python3.9/site-packages/urllib3/connectionpool.py:1061 InsecureRequestWarning: Unverified HTTPS request is being made to host 'insideto-gis.toronto.ca'. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/1.26.x/advanced-usage.html#ssl-warnings