Python: Remove unwanted recursion

Depending on `localFlowStep` meant that this predicate ended up being
recursive with itself (by way of flow summaries which depend on API
graphs, which in turn depend on import resolution).

Changing this to use the simple local flow step predicate that we use
for type tracking should fix this issue.

Author: tausbn

python/ql/lib/semmle/python/dataflow/new/internal/ImportResolution.qll

@@ -8,6 +8,7 @@ private import python
 private import semmle.python.dataflow.new.DataFlow
 private import semmle.python.dataflow.new.internal.ImportStar
 private import semmle.python.dataflow.new.TypeTracker
+private import semmle.python.dataflow.new.internal.DataFlowPrivate
 
 /**
  * Python modules and the way imports are resolved are... complicated. Here's a crash course in how
@@ -279,7 +280,7 @@ module ImportResolution {
     or
     // Flow (local or global) forward to a later reference to the module.
     exists(DataFlow::Node ref | ref = getModuleReference(m) |
-      DataFlow::localFlow(ref, result)
+      simpleLocalFlowStepForTypetracking(ref, result)
       or
       exists(DataFlow::ModuleVariableNode mv |
         mv.getAWrite() = ref and