fix(tests): Add httpx to the dev extra for chatlas (#2437)

Author: schloerke

pyproject.toml

@@ -152,6 +152,11 @@ dev = [
     "shinyswatch>=0.7.0",
     "python-dotenv",
     "chatlas>=0.6.1",
+    # chatlas imports `httpx` without declaring it, relying on `openai` to pull
+    # it in. openai 3.0.0 switched to the `httpx2` distribution, so `import
+    # chatlas` now fails with ModuleNotFoundError unless httpx is installed
+    # directly. Drop this once chatlas declares its own httpx dependency.
+    "httpx",
     "aiohttp",
     "beautifulsoup4",
 ]