[FIX] pad: Use a `post` instead of a `get` on the request
[FIX] pad: Use a `post` instead of a `get` on the request

The old code used Request(data=)]( https://github.com/odoo-dev/odoo/blob/723b083cf5e51beec166059350466e5504db46c9/addons/pad/py_etherpad/__init__.py#L39)

Which however means it did a POST:

> the HTTP request will be a POST instead of a GET when the data parameter is provided

yet the code currently uses `requests.get`, so [it looks very much like a mistake when converting from urllib to requests](https://github.com/odoo-dev/odoo/commit/01e35141479b8dfc4a390518f89fc52e7cec5396#diff-3303eb022ac36e1ef7258c28f24f6de6).

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