Update URLs to django documn version

parsers/logbooks.py

@@ -39,7 +39,7 @@ todo = """
             file_in = open(logbookfile,'rb')
             txt = file_in.read().decode("latin1")
             
-- use Fixtures https://docs.djangoproject.com/en/4.1/ref/django-admin/#django-admin-loaddata to cache
+- use Fixtures https://docs.djangoproject.com/en/dev/ref/django-admin/#django-admin-loaddata to cache
   data for old logbooks? Not worth it..
 """
 MAX_LOGBOOK_ENTRY_TITLE_LENGTH = 200

parsers/survex.py

@@ -2091,7 +2091,7 @@ def LoadSurvexBlocks():
     # why does this increase memory use by 20 MB ?!
     # We have foreign keys, Django needs to load the related objects
     # in order to resolve how the relation should handle the deletion:
-    # https://docs.djangoproject.com/en/3.2/ref/models/fields/#django.db.models.ForeignKey.on_delete
+    # https://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.ForeignKey.on_delete
     SurvexBlock.objects.all().delete()
     SurvexFile.objects.all().delete()
     SurvexDirectory.objects.all().delete()