Remove unneeded deps (#19)

* remove unneeded dependencies

langchain-openai is not a direct dependency, and is only needed when running an OpenAI compatible model with data science service deployment
oracle-ads is also only needed when using Data Science deployment. These are optional requirements

* loosen dependencies so switching library from langchain-community is more seamless.

* loosen langchain version requirements

* lowest version needed for ToolMessage model

Author: streamnsight

libs/oci/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langchain-oci"
-version = "0.1.3"
+version = "0.1.4"
 description = "An integration package connecting OCI and LangChain"
 authors = []
 readme = "README.md"
@@ -12,12 +12,11 @@ license = "UPL"
 
 [tool.poetry.dependencies]
 python = ">=3.9,<4.0"
-langchain-core = ">=0.3.15,<0.4"
-langchain-openai = ">=0.3.9"
-oci = ">=2.155.1"
-oracle-ads = ">=2.13.16"
+langchain-core = ">=0.3.20,<1.0.0"
+langchain = ">=0.3.20,<1.0.0"
+oci = ">=2.144.0"
 pydantic = ">=2,<3"
-aiohttp = ">=3.12.14"
+# aiohttp = ">=3.12.14"
 
 [tool.poetry.group.test]
 optional = true