Patch Release

This release is a patch release that addresses an issue for users that have TRL installed without PEFT

What's Changed

• Release: v0.7.3 by @younesbelkada in https://github.com/huggingface/trl/pull/965
• set dev version by @younesbelkada in https://github.com/huggingface/trl/pull/966
• [core] Fix peft config typehint by @younesbelkada in https://github.com/huggingface/trl/pull/967
• Pin bnb to <=0.41.1 by @younesbelkada in https://github.com/huggingface/trl/pull/968

Full Changelog: https://github.com/huggingface/trl/compare/v0.7.3...v0.7.4