Python: Handle __all__ assigned to a tuple

Examples where this is used in real code:

- 76c0b32f82/django/core/files/temp.py (L24)
- 76c0b32f82/django/contrib/gis/gdal/__init__.py (L44-L49)

python/ql/src/semmle/python/Module.qll

@@ -129,7 +129,11 @@ class Module extends Module_, Scope, AstNode {
       a.defines(all) and
       a.getScope() = this and
       all.getId() = "__all__" and
-      a.getValue().(List).getAnElt().(StrConst).getText() = name
+      (
+        a.getValue().(List).getAnElt().(StrConst).getText() = name
+        or
+        a.getValue().(Tuple).getAnElt().(StrConst).getText() = name
+      )
     )
   }
 

python/ql/test/library-tests/modules/__all__/DeclaredInAll.expected

@@ -1,3 +1,5 @@
 | all_dynamic.py:0:0:0:0 | Module all_dynamic | foo |
 | all_list.py:0:0:0:0 | Module all_list | bar |
 | all_list.py:0:0:0:0 | Module all_list | foo |
+| all_tuple.py:0:0:0:0 | Module all_tuple | bar |
+| all_tuple.py:0:0:0:0 | Module all_tuple | foo |