v0.7.7: Patch release PPO & DDPO tags

A fix has been introduce to fix a breaking change with PPOTrainer.push_to_hub() and DDPOTrainer.push_to_hub()

• [PPOTrainer / DDPOTrainer] Fix ppo & ddpo push to Hub by @younesbelkada in #1141

What's Changed

• Release: v0.7.6 by @younesbelkada in #1134
• set dev version by @younesbelkada in #1135
• clear up the parameters of supervised_finetuning.py by @sywangyi in #1126
• Add type hints to core.py by @zachschillaci27 in #1097
• fix_ddpo_demo by @zhangsibo1129 in #1129
• Add npu support for ppo example by @zhangsibo1129 in #1128

New Contributors

• @zachschillaci27 made their first contribution in #1097
• @zhangsibo1129 made their first contribution in #1129

Full Changelog: v0.7.6...v0.7.7