chore: update test dependencies for httpx migration

- replace requests-mock with respx for httpx test mocking
- add pytest-asyncio configuration with auto mode
- remove types-requests dependency
- update charset-normalizer, requests, and urllib3 versions

Author: tharropoulos

pyproject.toml

@@ -40,13 +40,15 @@ build-backend = "setuptools.build_meta"
 dev = [
     "mypy>=1.19.0",
     "pytest",
+    "pytest-asyncio",
     "coverage",
     "pytest-mock",
     "python-dotenv",
-    "types-requests",
     "faker",
     "ruff>=0.11.11",
     "isort>=6.0.1",
+    "respx>=0.22.0",
+    "requests",
 ]
 
 [tool.uv]

pytest.ini

@@ -1,4 +1,5 @@
 [pytest]
 pythonpath = src
+asyncio_mode = auto
 markers =
     open_ai