Incompatibility with payum/payum ^1.7

[lruozzi9]

Sylius version affected: 1.10.y

Description
By using a payum/payum version greater than 1.7 (packages says that the latest version is 1.8 but in GH the latest is 1.7 🤔 ) there is an error with the doctrine schema mappings:

[ERROR] The database schema is not in sync with the current mapping file.

Launching the doctrine:schema:update --dump-sql you will get the query:

ALTER TABLE sylius_gateway_config CHANGE config config JSON NOT NULL;

Steps to reproduce
Installing Sylius with a version of payum/payum greater than 1.7.

Possible Solution
A first, immediately, solution could be to add a conflict with this version of payum/payum.

[lruozzi9]

This is the incriminated commit! This change will lead to an error if you are using MySQL, don't know for other DBMS.

[lruozzi9]

Already noticed here:#13214 (comment).