chore(deps): update dependency mypy to v2.3.1 (#220)

Author: renovate-bot

pyproject.toml

@@ -40,7 +40,7 @@ Changelog = "https://github.com/googleapis/llama-index-cloud-sql-pg-python/blob/
 test = [
     "black[jupyter]==26.5.1",
     "isort==8.0.1",
-    "mypy==2.3.0",
+    "mypy==2.3.1",
     "pytest-asyncio==1.4.0",
     "pytest==9.1.1",
     "pytest-cov==7.1.0"