Downloading the folktables dataset fails on MacOS

[andrewklayk]

Downloading the folktables dataset through download: True throws an SSLVerificationError:

requests.exceptions.SSLError: HTTPSConnectionPool(host='www2.census.gov', port=443): Max retries exceeded with url: /programs-surveys/acs/tech_docs/pums/data_dict/PUMS_Data_Dictionary_2018.csv (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1006)')))

Steps to reproduce:

1. Install the repository on MacOS
2. Run python experiments/run_folktables.py alg=sslalm n_runs=2 run_maxtime=2