drop pytest-httpx version to match our httpx version

Author: RayBB

requirements_test.txt

@@ -9,6 +9,6 @@ pymemcache==4.0.0
 pytest==8.3.5
 pytest-asyncio==0.26.0
 pytest-cov==6.1.1
-pytest-httpx==0.35.0
+pytest-httpx==0.33.0
 ruff==0.11.13
 safety==2.3.5