Update cryptography and certifi to resolve dependabot security alerts. #1485
Description
- https://github.com/googleapis/gapic-generator-java/security/dependabot/6
- https://github.com/googleapis/gapic-generator-java/security/dependabot/14
- https://github.com/googleapis/gapic-generator-java/security/dependabot/12