Remove exclusion of dumps.wikimedia.org, as it supports SSL

dumps.wikimedia.org is currently excluded from the Wikimedia ruleset, but it supports SSL. There might be a reason I am not aware of to exclude it, but it does not appear to be so.

All the other subdomains excluded do not support SSL, although many redirect to dumps.wikimedia.org. It might be worth it to redirect them directly to dumps.wikimedia.org and enable SSL at the same time to avoid a request being sent without SSL to the subdomain first.