Update CA bundle to new set of certificates

[AaronAtDuo]

Description

Update the CA bundle

Motivation and Context

So the client continues to work after the existing bundle expires.

How Has This Been Tested?

Automated tests pass.
Also manually tested on Admin example

python3 report_users_and_phones.py 
Admin API integration key ("DI..."): <...>
integration secret key: <...>
API hostname ("api-....duosecurity.com"): <...>

[+] Report of all users and associated phones:
<...>

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[jeffreyparker]

Verified that the new ca_certs.pem is identical to the new cert bundle