Bump the production branch to 4.7 and adjust for the changes between 4.3 and 4.7:
- Node 24.21.0 and Ruby 4.0.7 (via ruby-build v20260924)
- Redis 7.4.11 (Mastodon 4.5 requires >= 7.0)
- Replace ImageMagick with libvips (required since 4.6) and libidn11 with libidn
- Split database migrations into pre-/post-deployment phases and rebuild
the Elasticsearch accounts index mappings (required since 4.4)
- Remove the OTP_SECRET environment variable (removed in 4.4)
- Disable email subscriptions (new optional feature in 4.6) and force the
default locale (DEFAULT_LOCALE no longer overrides it since 4.4)
- Add the new fasp Sidekiq queue
- Enable corepack for yarn instead of the removed no-arg 'corepack prepare'