langchain-core==0.2.20

Changes since langchain-core==0.2.19

core[patch]: Release 0.2.20 (#24322)
Docs: Add how to dispatch custom callback events (#24278)
core: docstrings vectorstores update (#24281)
core[patch]: fix Typing.cast import (#24313)
core: docstrings documents (#23506)
core[patch]: Add encoding options when create prompt template from a file (#24054)
core[patch]: docstrings langchain_core/ files update (#24285)
core[patch]: Update typing for template format to include jinja2 as a Literal (#24144)
core[patch]: allow message utils to work with lcel (#23743)
docs: Spell check fixes (#24217)
core docstrings tracers update (#24211)
core: docstrings utils update (#24213)