Update Python version requirements to 3.10

Author: dishaprakash

pyproject.toml

@@ -4,7 +4,7 @@ dynamic = ["version"]
 description = "LangChain integrations for Google Cloud SQL for PostgreSQL"
 readme = "README.rst"
 license = {file = "LICENSE"}
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 authors = [
     {name = "Google LLC", email = "googleapis-packages@google.com"}
 ]
@@ -13,7 +13,6 @@ dependencies = [
     "cloud-sql-python-connector[asyncpg] >= 1.10.0, <2.0.0",
     "numpy>=1.24.4, <3.0.0; python_version >= '3.11'",
     "numpy>=1.24.4, <=2.2.6; python_version == '3.10'",
-    "numpy>=1.24.4, <=2.0.2; python_version <= '3.9'",
     "langchain-postgres>=0.0.16",
 ]
 
@@ -22,10 +21,10 @@ classifiers = [
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
 ]
 
 [tool.setuptools.dynamic]
@@ -43,8 +42,7 @@ langgraph = [
 ]
 test = [
     "black[jupyter]==25.9.0",
-    "isort==6.1.0; python_version == '3.9'",
-    "isort==7.0.0; python_version >= '3.10'",
+    "isort==7.0.0",
     "mypy==1.18.2",
     "pytest-asyncio==0.26.0",
     "pytest==8.4.2",
@@ -64,7 +62,7 @@ target-version = ['py39']
 profile = "black"
 
 [tool.mypy]
-python_version = 3.9
+python_version = "3.10"
 warn_unused_configs = true
 disallow_incomplete_defs = true