Upgrade Flask, Flask-SQLAlchemy, Flask-WTF, Flask-Babel, Flask-Security-Too, WTForms, Werkzeug and keep backward compatibility with Python 3.7

web/pgadmin/misc/__init__.py

@@ -10,7 +10,8 @@
 """A blueprint module providing utility functions for the application."""
 
 from pgadmin.utils import driver
-from flask import url_for, render_template, Response, request, current_app
+from flask import render_template, Response, request, current_app
+from flask.helpers import url_for
 from flask_babel import gettext
 from flask_security import login_required
 from pgadmin.utils import PgAdminModule, replace_binary_path, \
@@ -36,10 +37,6 @@ MODULE_NAME = 'misc'
 class MiscModule(PgAdminModule):
     LABEL = gettext('Miscellaneous')
 
-    def get_own_stylesheets(self):
-        stylesheets = []
-        return stylesheets
-
     def register_preferences(self):
         """
         Register preferences for this module.