relax deps for yaml (#8713)

context: https://github.com/yaml/pyyaml/issues/724

I think this is fine? I don't think we use yaml too heavily

libs/langchain/poetry.lock

@@ -13438,4 +13438,4 @@ text-helpers = ["chardet"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.1,<4.0"
-content-hash = "d31f0cfa520c75d9342b58db50296fdc4833b7f6d5895660ae47c26d6e5758ac"
+content-hash = "84ededcf21a742653863c033dd31e1b24af7562d479c179cd58ba22b2a9805e9"

libs/langchain/pyproject.toml

@@ -15,7 +15,7 @@ python = ">=3.8.1,<4.0"
 pydantic = "^1"
 SQLAlchemy = ">=1.4,<3"
 requests = "^2"
-PyYAML = ">=5.4.1"
+PyYAML = ">=5.3"
 numpy = "^1"
 azure-core = {version = "^1.26.4", optional=true}
 tqdm = {version = ">=4.48.0", optional = true}