relax depndencies (#28)

Relax dependencies a bit

Author: eyurtsev

poetry.lock

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langchain-postgres"
-version = "0.0.2"
+version = "0.0.3"
 description = "An integration package connecting Postgres and LangChain"
 authors = []
 readme = "README.md"
@@ -10,12 +10,12 @@ license = "MIT"
 [tool.poetry.dependencies]
 python = "^3.9"
 langchain-core = "^0.1"
-psycopg = "^3.1.18"
+psycopg = "^3"
 langgraph = "^0.0.32"
 psycopg-pool = "^3.2.1"
-sqlalchemy = "^2.0.29"
+sqlalchemy = "^2"
 pgvector = "^0.2.5"
-numpy = "^1.26.4"
+numpy = "^1"
 
 [tool.poetry.group.docs.dependencies]