Changes since langchain-core==1.4.7

chore: bump jupyter-server from 2.18.0 to 2.20.0 in /libs/core (#38252) chore: bump tornado from 6.5.6 to 6.5.7 in /libs/core (#38184) chore: bump bleach from 6.3.0 to 6.4.0 in /libs/core (#38198) release(core): 1.4.8 (#38254) refactor(langchain-classic): remove code for Python < 3.10 (#38194) perf(core): memoize BaseTool.tool_call_schema subset model and cache model_json_schema (#38073) style(core): fix style in langchain_core/_security (#38189) fix(core): preserve usage token details in v3 streaming events (#38021) fix(core): disallow_any_generics (#38156) chore(core): add mypy warn_unreachable (#38109) docs: refresh README installation and resources (#38119) test(core,langchain): update tests for explicit deserialization allowlists (#38118)