Crash in Gitea sync task if a host is not contactable

[Floppy]

With a newly set up dev environment:

1. rake db:seed
2. rake repositories:sync_recently_active
3. 💥

Error message:

Caused by:
Socket::ResolutionError: Failed to open TCP connection to git.*****.:443 (getaddrinfo(3): nodename nor servname provided, or not known) (Socket::ResolutionError)
/Users/james/Source/github.com/ecosyste-ms/repos/app/models/hosts/gitea.rb:96:in 'Hosts::Gitea#load_repo_names'