test: removing codedev test dependency

[sethgrid]

Fixes

Fix build by removing dead dependency.

Per the announcment:
https://about.codecov.io/blog/message-regarding-the-pypi-package/ coddev deprecated their pypi package on april 12, 2023 causing the build to break

We no longer are registered at codedev:
https://app.codecov.io/gh/sendgrid/sendgrid-python "This repo has been deactivated"

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

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[charan678]

LGTM