whitelist h11 (#2137)

## Changes
whitelist h11

### 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

@@ -4456,6 +4456,19 @@
   "gunicorn": {
     "gunicorn": []
   },
+  "h11": {
+    "h11": [],
+    "h11._abnf": [],
+    "h11._connection": [],
+    "h11._events": [],
+    "h11._headers": [],
+    "h11._readers": [],
+    "h11._receivebuffer": [],
+    "h11._state": [],
+    "h11._util": [],
+    "h11._version": [],
+    "h11._writers": []
+  },
   "h3": {
     ".........setup": [],
     "h3": [],