Reject relays running 0.4.1

Now that 0.4.1 has reached end-of-life, it's time for directory authorities to stop accepting relays running it.

See legacy/trac#32672 (moved) for the last time we did this.

Looking at the graphs, I don't see a significant change in the drop-off rate for deprecated versions in between when we announced that they were deprecated, and when we finally removed them. Maybe this time we should just send out an announcment, wait a month, then reject the relays?