Fix type errors and package type information

pyproject.toml

@@ -17,9 +17,12 @@ requires-python = ">=3.8"
 dependencies = ["boto3>=1.3.1,<1.36.0", "urllib3>=2.0.0,<3.0.0"]
 
 [build-system]
-requires = ["setuptools"]
+requires = ["setuptools>=61"]
 build-backend = "setuptools.build_meta"
 
+[tool.setuptools.package-data]
+urllib3_sigv4 = ["py.typed"]
+
 [tool.ruff]
 cache-dir = "~/.cache/ruff"
 line-length = 79

urllib3_sigv4/__init__.py

@@ -27,7 +27,7 @@ def __init__(
         region: str | None = None,
         access_key: str | None = None,
         secret_key: str | None = None,
-    ):
+    ) -> None:
         session = boto3._get_default_session()
         region = session.region_name if region is None else region
         if region is None:
@@ -87,7 +87,7 @@ def request(
             **urlopen_kw,
         )
 
-    def urlopen(
+    def urlopen(  # type: ignore[override]
         self, method: str, url: str, redirect: bool = True, **kw: Any
     ) -> BaseHTTPResponse:
         # Sign the request if required before making the actual HTTP request.