This site uses Cloudflare Cloudflare Bot Fight Mode, you need to use TLS Client, try with TLS Requests to bypass.

pip install wrapper-tls-requests

Example

import tls_requests
r = tls_requests.get('https://www63.bb.com.br/portalbb/djo/id/resgate/dadosResgate.bbx')
print(r) # <Response [200]>