v0.12.0

Changed

• Python bumped to >= 3.10, tests up to 3.13
• Bumped datasets to >= 3.0, < 3.2
• Bumped lightning to < 2.6
• Remove hard dependency on sentencepiece. Users can still install it if the tokenizer they use
  needs it, but their release policy is too brittle to allow them to block us, especially since it's
  only a quality of life dependency for us.
• Bumped torch to < 2.7
• Bumped tokenizers to < 0.22
• Bumped transformers to allow < 5.0, skipping versions from 4.41 to 4.43

Full Changelog: v0.11.0...v0.12.0