Changes since langchain-xai==1.1.0
fix(xai): ensure citations are streamed just once (#34556)
release(xai): 1.2.0 (#34555)
fix(xai): stream usage metadata by default (#34531)
fix(core): serialization patch (#34455)
fix(openai): filter function_call blocks in token counting (#34396)
release(openai): 1.1.6: update max input tokens for gpt-5 series (#34419)
release(openai): 1.1.5 (#34409)
fix(openai): rely on langchain-core for setting chunk_position (#34404)
chore: update core dep in lockfiles (#34216)