Updates fog to v1.14.0 (with locked Nokogiri)

This updates the referenced version of fog to be v1.14.0 (via v.1.13.0) and locks nokogiri to <1.16 where they removed 1.8.7 support.

@johnl In order to update and prevent fog deprecations from appearing in the output, this removes some calls to `#connection=` which did not appear to be doing anything.

Setting the "service" (old name was connection) should be redundant because you accessed the fog API through the service originally. So there's no need to list accounts and reset their connection.

That behaviour may be related to record caching where the model is initialised from a file but I can't say I've seen that working. That may be another issue of itself.