fix #4987 Update use of random.sample for python 3.11

Author: joemull

src/core/homepage_elements/journals/hooks.py

@@ -16,7 +16,7 @@ def get_random_journals():
 
     sample_size = min(6, journals.count())
 
-    return random.sample(set(journals), sample_size)
+    return random.sample(list(journals), sample_size)
 
 
 def yield_homepage_element_context(request, homepage_elements):

src/core/homepage_elements/journals_and_html/hooks.py

@@ -20,7 +20,7 @@ def get_random_journals():
 
     sample_size = min(6, journals.count())
 
-    return random.sample(set(journals), sample_size)
+    return random.sample(list(journals), sample_size)
 
 
 def yield_homepage_element_context(request, homepage_elements):