chore(tests): add cryptography to constraints file

[daniel-sanche]

Add new required dependency to test constraints, to ensure minimum versions are tested

Also, moved constraints file to 3.8, since 3.7 is no longer supported

[gemini-code-assist]

Summary of Changes

Hello @daniel-sanche, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the Python 3.7 test constraints by incorporating the cryptography library. The primary goal is to enforce a specific minimum version for this dependency during testing, thereby enhancing the reliability and consistency of the test suite across various environments.

Highlights

• Dependency Management: Added cryptography==38.0.3 to the testing/constraints-3.7.txt file.
• Testing Consistency: This addition ensures that minimum versions of required dependencies, specifically cryptography, are consistently tested within the Python 3.7 environment.

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[gemini-code-assist]

Code Review

This pull request adds cryptography to the test constraints file. While adding the dependency is correct to ensure minimum versions are tested, there's a potential issue with the file being modified. The file testing/constraints-3.7.txt targets Python 3.7, but the project's setup.py specifies that the minimum supported Python version is 3.8. Please see the specific comment for more details.