fix(#1623): fix xmlns and xmlns:xsi values

Replaced `https` by `http` in  `xmlns` and `xmlns:xsi` attribute values, to fix XML validation errors.

src/Resources/config/doctrine/BaseUser.mongodb.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<doctrine-mongo-mapping xmlns="https://doctrine-project.org/schemas/odm/doctrine-mongo-mapping" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping https://www.doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd">
+<doctrine-mongo-mapping xmlns="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping https://www.doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd">
     <mapped-superclass name="Sonata\UserBundle\Document\BaseUser">
         <field name="username" type="string"/>
         <field name="usernameCanonical" type="string"/>