Changes since langchain-core==0.3.7

core[patch]: Release 0.3.8 (#27046) core[patch]: Support injected tool args that are arbitrary types (#27045) core[patch]: fix init of RunnableAssign (#26903) multiple: update docs urls to latest 2 (#26837) core[patch]: improve index/aindex api when batch_size<n_docs (#25754) core[patch]: Add kwargs to Runnable (#27008) Merge pull request #26794