Log Message:
devel/ruby-i18n: update to 1.8.7

1.8.7 (2021-01-04)

* Fixed a regression with fallback logic: see issues #547, #546 and #542.

1.8.6 (2021-01-01)

* Fallbacks are now stored in Thread.current for multi-threading
  compatibility: #542

* no-op arguments are no longer allowed for I18n.t calls -- fixes an
  incompatibility with Ruby 3.0: #545

This gem's GitHub workflow files have been updated to ensure compatibility
between new Rails versions (6.1) and the new Ruby release (3.0).  See the
"Actions" tab on GitHub for the full range of supported Rails and Ruby
versions.