langchain-perplexity 1.4.1

Changes since langchain-perplexity==1.4.0

release(perplexity): 1.4.1 (#39826) fix(perplexity): include type="message" on Responses input items (#39774) fix(perplexity): preserve caller extra_body (#39203) chore: bump pillow from 12.2.0 to 12.3.0 in /libs/partners/perplexity (#38991) chore(deps): refresh lockfiles (#38746) fix(perplexity): use supported Responses API model (#38337) chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/partners/perplexity (#38290) chore: bump langsmith from 0.8.5 to 0.8.18 in /libs/partners/perplexity (#38289) docs: refresh README installation and resources (#38119) release(core): 1.4.7 (#38111) fix(core,partners): rename package version trace metadata (#38110) style(core,langchain,langchain-classic,partners): replace double backticks in docstrings (#38095) release(core): 1.4.6 (#38061) feat(core,partners): add package version tracking to tracing metadata (#35295) chore(infra): bump mypy to 2.1 and unify type-check config across the monorepo (#36470) feat(standard-tests): validate tool call chunks during streaming (#34707) chore(partners): bump locks (#38052)