owncloud/core

Bugfix: Adjust request body options for Guzzle7

In Guzzle major version 7 the body option of a request must be a string
or similar. Requests that send arrays of items have been adjusted to use the
form_params option. Developers of apps that use lib/private/Http/Client/IClient.php
should check any calls to ensure that arrays of items are not passed in the body
option. See the diffs of PHP docs in the linked PR for examples.

https://github.com/owncloud/core/pull/40652
https://github.com/owncloud/core/issues/40649