Update Mastodon from v2.7.0 to v2.7.1

not difficult at all. trace the operation that is wrote on the release note.

run as mastodon user.

~$ cd ~/live
~/live$ git fetch
~/live$ git checkout v2.7.1
~/live$ bundle install
~/live$ RAILS_ENV=production bundle exec rails assets:precompile

run as root.

# systemctl stop mastodon-web
# systemctl stop mastodon-streaming
# systemctl restart mastodon-sidekiq
# systemctl start mastodon-streaming
# systemctl start mastodon-web