fix: loosen langgraph version pin from ==1.1.6 to >=1.1,<2 (#32)

Author: zurfjereluhmie

pyproject.toml

@@ -39,7 +39,7 @@ Changelog     = "https://github.com/zurfjereluhmie/evalwire/blob/main/CHANGELOG.
 "Bug Tracker" = "https://github.com/zurfjereluhmie/evalwire/issues"
 
 [project.optional-dependencies]
-langgraph  = ["langgraph==1.1.6"]
+langgraph  = ["langgraph>=1.1,<2"]
 langchain  = ["openinference-instrumentation-langchain>=0.1"]
 openai     = ["openinference-instrumentation-openai>=0.1"]
 llm-judge  = ["langchain-core>=1.0,<2"]
@@ -74,7 +74,7 @@ demo = [
     "langchain>=1.0,<2",
     "langchain-core>=1.0,<2",
     "langchain-openai>=1.0,<2",
-    "langgraph==1.1.6",
+    "langgraph>=1.1,<2",
     "openai>=2.0,<3",
     "openinference-instrumentation-langchain>=0.1,<0.2",
     "python-dotenv>=1.0,<2",