Update mysql client version to 1.4.0

From yoga, django 3.x is used and it requires mysqlclient
1.4.0 or newer.

Change-Id: If2090b204122c623bdf3211ae98a9b855fc5b259

horizon/Chart.yaml

@@ -14,7 +14,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm Horizon
 name: horizon
-version: 0.3.1
+version: 0.3.2
 home: https://docs.openstack.org/horizon/latest/
 icon: https://www.openstack.org/themes/openstack/images/project-mascots/Horizon/OpenStack_Project_Horizon_vertical.png
 sources:

horizon/templates/bin/_manage.py.tpl

@@ -23,7 +23,7 @@ import os
 import sys
 
 import pymysql
-pymysql.version_info = (1, 3, 13, "final", 0)
+pymysql.version_info = (1, 4, 0, "final", 0)
 pymysql.install_as_MySQLdb()
 
 from django.core.management import execute_from_command_line

releasenotes/notes/horizon.yaml

@@ -38,4 +38,5 @@ horizon:
   - 0.2.26 Support SSL identity endpoint
   - 0.3.0 Remove support for Train and Ussuri
   - 0.3.1 Fix container infra api version in values
+  - 0.3.2 Update mysql client version to 1.4.0
 ...