Patch release: Multi-tag instead of single tags for xxxTrainer

This is a patch release to push multiple tags (e.g. trl & sft) instead of one tag

What's Changed

• Release: v0.7.5 by @younesbelkada in https://github.com/huggingface/trl/pull/1131
• set dev version by @younesbelkada in https://github.com/huggingface/trl/pull/1132
• [xxxTrainer] multi-tags support for tagging by @younesbelkada in https://github.com/huggingface/trl/pull/1133

Full Changelog: https://github.com/huggingface/trl/compare/v0.7.5...v0.7.6