Changes since langchain-core==1.4.9

release(core): 1.5.0 (#38978) feat(core): add reasoning_effort as a standard chat model parameter (#38887) chore: bump soupsieve from 2.8 to 2.8.4 in /libs/core (#38750) chore: bump mistune from 3.2.1 to 3.3.0 in /libs/core (#38783)