[release] Update version to v0.28.0 for new release 

[fine_tuning] Add CLI for fine_tuning.jobs (openai#592) 

Updates to the fine tuning SDK + addition of pagination primitives (o… …penai#582) * Add support for new fine_tuning SDK + pagination primitives * typo

Bump version to 0.27.8 (openai#480) 

Update version.py (openai#458) Bump for release

fix error messages mentioning support@ (openai#427) Co-authored-by: Shyamal H Anadkat <shyamal@openai.com>

bump version (openai#428) 

Bump to 0.27.5 (openai#417) 

Bump version to v0.27.4 (openai#373) 

[audio] Use supplied api key (openai#170) (openai#369)