fix date (#5694)

model-optimizer/mo/utils/get_ov_update_message.py

@@ -8,7 +8,7 @@ msg_fmt = 'It\'s been a while, check for a new version of ' + \
 
 
 def get_ov_update_message():
-    expected_update_date = datetime.date(year=2021, month=12, day=15)
+    expected_update_date = datetime.date(year=2021, month=10, day=15)
     current_date = datetime.date.today()
 
     link = 'https://software.intel.com/content/www/us/en/develop/tools/openvino-toolkit/download.html?cid=other&source=prod&campid=ww_2021_bu_IOTG_OpenVINO-2021-4-LTS&content=upg_all&medium=organic'