fix(misc): Handle cache unpickling failure in release check

Guard `cache.get('latest_release')` during release checks to prevent a
500 when stale cached data can't be unpickled after dependency upgrades.
On failure, log at debug level and delete the affected cache key.

Fixes #21254

netbox/netbox/navigation/menu.py

@@ -409,10 +409,60 @@ ADMIN_MENU = Menu(
         MenuGroup(
             label=_('Authentication'),
             items=(
-                get_model_item('users', 'user', _('Users')),
-                get_model_item('users', 'group', _('Groups')),
-                get_model_item('users', 'token', _('API Tokens')),
-                get_model_item('users', 'objectpermission', _('Permissions'), actions=['add']),
+                MenuItem(
+                    link='users:user_list',
+                    link_text=_('Users'),
+                    staff_only=True,
+                    permissions=['users.view_user'],
+                    buttons=(
+                        MenuItemButton(
+                            link='users:user_add',
+                            title='Add',
+                            icon_class='mdi mdi-plus-thick',
+                            permissions=['users.add_user']
+                        ),
+                        MenuItemButton(
+                            link='users:user_bulk_import',
+                            title='Import',
+                            icon_class='mdi mdi-upload',
+                            permissions=['users.add_user']
+                        )
+                    )
+                ),
+                MenuItem(
+                    link='users:group_list',
+                    link_text=_('Groups'),
+                    staff_only=True,
+                    permissions=['users.view_group'],
+                    buttons=(
+                        MenuItemButton(
+                            link='users:group_add',
+                            title='Add',
+                            icon_class='mdi mdi-plus-thick',
+                            permissions=['users.add_group']
+                        ),
+                        MenuItemButton(
+                            link='users:group_bulk_import',
+                            title='Import',
+                            icon_class='mdi mdi-upload',
+                            permissions=['users.add_group']
+                        )
+                    )
+                ),
+                MenuItem(
+                    link='users:token_list',
+                    link_text=_('API Tokens'),
+                    staff_only=True,
+                    permissions=['users.view_token'],
+                    buttons=get_model_buttons('users', 'token')
+                ),
+                MenuItem(
+                    link='users:objectpermission_list',
+                    link_text=_('Permissions'),
+                    staff_only=True,
+                    permissions=['users.view_objectpermission'],
+                    buttons=get_model_buttons('users', 'objectpermission', actions=['add'])
+                ),
             ),
         ),
         MenuGroup(

netbox/netbox/views/misc.py

@@ -1,5 +1,6 @@
 import re
 from collections import namedtuple
+import logging
 
 from django.conf import settings
 from django.contrib import messages
@@ -28,6 +29,8 @@ __all__ = (
     'SearchView',
 )
 
+logger = logging.getLogger(f'netbox.{__name__}')
+
 Link = namedtuple('Link', ('label', 'viewname', 'permission', 'count'))
 
 
@@ -50,7 +53,14 @@ class HomeView(ConditionalLoginRequiredMixin, View):
         # Check whether a new release is available. (Only for superusers.)
         new_release = None
         if request.user.is_superuser:
-            latest_release = cache.get('latest_release')
+            # cache.get() can raise if the cached value can't be unpickled after dependency upgrades
+            try:
+                latest_release = cache.get('latest_release')
+            except Exception:
+                logger.debug("Failed to read 'latest_release' from cache; deleting key", exc_info=True)
+                cache.delete('latest_release')
+                latest_release = None
+
             if latest_release:
                 release_version, release_url = latest_release
                 if release_version > version.parse(settings.RELEASE.version):