For some reason AIOHTTPTransport started to use MultiDict after doing
some adjustments in the GraphQL query, which made `filecache` fail
because MultiDict object are not pickle-able.
Changing the transport strategy from AIOHTTPTransport to
RequestsHTTPTransport, which dropped one requirement. We aren't doing
async anyway, all the calls were sync before.
Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25940>