Fix issue on Python 3.13.1

For some reason, python/cpython#125846 broke the
ability to iterate over `HocObject`s, so as a workaround, we can first
cast it to a Python list.

Author: JCGoran

test/hoctests/tests/test_thread_partition.py

@@ -38,7 +38,7 @@ def assertpart(parts="default"):
     if str(parts) == "default":  # not round-robin but root order
         roots = h.SectionList()
         roots.allroots()
-        roots = [root for root in roots]
+        roots = [root for root in list(roots)]
         i = 0
         for ith in range(pc.nthread()):
             sl = pc.get_partition(ith)

test/pytest_coreneuron/test_basic.py

@@ -209,7 +209,7 @@ def test_HocObject_no_deferred_unref():
     for sec in h.allsec():
         print(sec)
         sl.append(sec=sec)
-    assert len([s for s in sl]) == 0
+    assert len([s for s in list(sl)]) == 0
 
 
 def test_deleted_sec():

test/pytest_coreneuron/test_zptrlist.py

@@ -49,7 +49,7 @@ def test_rvp():  # for coverage of ptrlist changes in nrniv/shape.cpp
     assert rvp.right() == 30.0
     sl = h.SectionList()
     rvp.list(sl)
-    sz = sum([1 for _ in sl])
+    sz = sum([1 for _ in list(sl)])
     assert sz == 3