Changes since langchain-xai==0.2.0
xai[patch]: release 0.2.1 (#29854)
xai[patch]: support dedicated structured output feature (#29853)
infra: add xai to scheduled testing (#29852)
multiple: fix uv path deps (#29790)
infra: add UV_FROZEN to makefiles (#29642)
infra: migrate to uv (#29566)
