Changes since langchain-core==1.5.1

release(core): 1.5.2 (#39108) fix(core): handle empty string in gateway env vars (#39107) chore: bump setuptools from 82.0.0 to 83.0.0 in /libs/core (#39032) chore: bump jupyterlab from 4.5.9 to 4.5.10 in /libs/core (#39033) chore: bump setuptools from 80.9.0 to 83.0.0 in /libs/text-splitters (#39029)