fix: requirements changes

[tiwarishubham635]

Fixes

Adding cython as dependency to support aiohttp wheel creation Issue: I made changes for java files in twilio oai generator and tests for python are failing - see logs here https://github.com/twilio/twilio-oai-generator/pull/527 I found the https://github.com/aio-libs/aiohttp/issues/6600#issuecomment-1673948107

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• [x] I have made a material change to the repo (functionality, testing, spelling, grammar)
• [x] I have read the Contribution Guidelines and my PR follows them
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• [ ] 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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[tiwarishubham635]

1. Issue: I made changes for java files in twilio oai generator and tests for python are failing - see logs here
2. PR Link
3. I found the fix here