BB2-3161: Update Cryptography Dependency

[loganbertram]

JIRA Ticket: BB2-3161

Task Summary: Affected versions of the cryptography package are vulnerable to Observable Timing Discrepancy. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data. Upgrade the package to version 42.0.4 as recommended by SNYK.

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[jimmyfagan]

Actually just caught something that might be an issue, I updated my Mac Dockerfile to point to 42.0.4 to match the update, and I couldn't start my container anymore. I see requirements.dev.txt still references the old version, that might be the issue? Not sure, I'll sync up with you to chat about it.