remove signatur checking (we do not use included git anymore) (#5018)

InvenTree/common/models.py

@@ -1616,13 +1616,6 @@ class InvenTreeSetting(BaseInvenTreeSetting):
             'requires_restart': True,
         },
 
-        'PLUGIN_CHECK_SIGNATURES': {
-            'name': _('Check plugin signatures'),
-            'description': _('Check and show signatures for plugins'),
-            'default': False,
-            'validator': bool,
-        },
-
         # Settings for plugin mixin features
         'ENABLE_PLUGINS_URL': {
             'name': _('Enable URL integration'),