v0.4.3

0.4.3 Patch release

Patch release - pin accelerate version

• Skip flaky test until next transformers release by @younesbelkada in https://github.com/lvwerra/trl/pull/410
• Pin accelerate version by @younesbelkada in https://github.com/lvwerra/trl/pull/414

Full Changelog: https://github.com/lvwerra/trl/compare/v0.4.2...v0.4.3