Update diagnostics snapshot file

Author: bouwew

tests/components/plugwise/snapshots/test_diagnostics.ambr

@@ -579,6 +579,19 @@
       'vendor': 'Plugwise',
       'zigbee_mac_address': 'ABCD012345670A11',
     }),
+    'e8ef2a01ed3b4139a53bf749204fe6b4': dict({
+      'dev_class': 'switching',
+      'members': list([
+        '02cf28bfec924855854c544690a609ef',
+        '4a810418d5394b3f82727340b91ba740',
+      ]),
+      'model': 'Switchgroup',
+      'name': 'Test',
+      'switches': dict({
+        'relay': True,
+      }),
+      'vendor': 'Plugwise',
+    }),
     'f1fee6043d3642a9b0a65297455f008e': dict({
       'available': True,
       'binary_sensors': dict({