Restore backward compatibility with LangChain 0.3.x

Update dependency ranges to support both LangChain 0.3.x and 1.x:
- langchain-core: >=0.3.78,<2.0.0 (was >=1.1.0,<2.0.0)
- langchain: >=0.3.20,<2.0.0 (was >=1.0.0,<2.0.0)
- langchain-openai: >=0.3.35,<2.0.0 (was >=1.0.0,<2.0.0)
- langgraph: >=0.2.0,<2.0.0 (was ^1.0.0)
- langchain-tests: >=0.3.12,<2.0.0 (was ^1.0.0)

Verified compatibility:
- All 63 unit tests pass with langchain-core 0.3.80
- All 63 unit tests pass with langchain-core 1.1.0

Author: fede-kamel

libs/oci/pyproject.toml

@@ -6,14 +6,14 @@ readme = "README.md"
 license = "UPL-1.0"
 requires-python = ">=3.10,<4.0"
 dependencies = [
-    "langchain-core>=1.1.0,<2.0.0",
-    "langchain>=1.0.0,<2.0.0",
+    "langchain-core>=0.3.78,<2.0.0",
+    "langchain>=0.3.20,<2.0.0",
     "oci>=2.161.0",
     "pydantic>=2,<3",
     "aiohttp>=3.12.14",
     "openai>=2.6.1",
     "oci-openai>=1.0.0",
-    "langchain-openai>=1.0.0,<2.0.0",
+    "langchain-openai>=0.3.35,<2.0.0",
 ]
 
 [project.urls]
@@ -32,13 +32,13 @@ pytest-cov = "^4.1.0"
 syrupy = "^4.0.2"
 pytest-asyncio = "^0.23.2"
 pytest-watcher = "^0.3.4"
-langchain-tests = "^1.0.0"
+langchain-tests = ">=0.3.12,<2.0.0"
 pytest-socket = "^0.7.0"
 pytest-mock = "^3.15.0"
 pytest-httpx = ">=0.30.0"
 responses = "^0.25.8"
-langgraph = "^1.0.0"
-langchain-openai = "^1.0.0"
+langgraph = ">=0.2.0,<2.0.0"
+langchain-openai = ">=0.3.35,<2.0.0"
 
 
 [tool.poetry.group.codespell]
@@ -51,7 +51,7 @@ codespell = "^2.2.6"
 optional = true
 
 [tool.poetry.group.test_integration.dependencies]
-langgraph = "^1.0.0"
+langgraph = ">=0.2.0,<2.0.0"
 
 [tool.poetry.group.lint]
 optional = true