Tox: Remove upper bound on hacking version

This change is required in order to support
testing on python 3.12

Test Plan:
pass - Run tox -eflake8 in a ubuntu:noble
       container

Change-Id: I427a7cab6c67905e0496cbbe07d4367d080dfb58
Signed-off-by: Leonardo Fagundes Luz Serrano <Leonardo.FagundesLuzSerrano@windriver.com>

libvirt/config.py

@@ -105,7 +105,7 @@ def item_from_list(data, fields, num):
     except TypeError as e:
         print('Sanity: incorrect key type for list or dictionary read:'
               ' % s ' % e, file=sys.stderr)
-    return(item)
+    return item
 
 
 # Checks if the input is valid path

requirements/test-requirements.txt

@@ -1,5 +1,4 @@
-hacking>=1.1.0,<=2.0.0 # Apache-2.0
+hacking>=1.1.0  # Apache-2.0
 yamllint === 1.32.0
 bashate === 2.1.1
 pylint === 2.13.9
-tox === 4.6.3