whitelist distro (#2133)

## Changes
whitelist distro

### 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

@@ -3141,6 +3141,10 @@
   "dill": {
     "dill": []
   },
+  "distro": {
+    "distro": [],
+    "distro.distro": []
+  },
   "docker": {
     "docker": []
   },