Deprecate the query mothod on the server container

The interface method has already been deprecated, but if some code uses
the concrete type instead, the deprecation is not shown (by phpstorm),
so I think it's better to have this method tagged as well.

The "fix" for this deprecation is to simply use `get` instead of
`query`. Right now this will work 100% the same, but the goal is to slim
down the interface and only use what PSR-11 offers.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>