whitelist httpx (#2139)

## Changes
whitelist httpx

### Linked issues
Progresses #1901 

### Functionality
None

### Tests
- [x] manually tested

Co-authored-by: Eric Vergnaud <[email protected]>

Author: ericvergnaud

src/databricks/labs/ucx/source_code/known.json

@@ -4930,6 +4930,31 @@
     "httpcore._trace": [],
     "httpcore._utils": []
   },
+ "httpx": {
+    "httpx": [],
+    "httpx._api": [],
+    "httpx._auth": [],
+    "httpx._client": [],
+    "httpx._compat": [],
+    "httpx._config": [],
+    "httpx._content": [],
+    "httpx._decoders": [],
+    "httpx._exceptions": [],
+    "httpx._main": [],
+    "httpx._models": [],
+    "httpx._multipart": [],
+    "httpx._status_codes": [],
+    "httpx._transports": [],
+    "httpx._transports.asgi": [],
+    "httpx._transports.base": [],
+    "httpx._transports.default": [],
+    "httpx._transports.mock": [],
+    "httpx._transports.wsgi": [],
+    "httpx._types": [],
+    "httpx._urlparse": [],
+    "httpx._urls": [],
+    "httpx._utils": []
+  },
   "huggingface-hub": {
     "huggingface_hub": []
   },