Bump i18n from 1.8.5 to 1.8.9

Bumps [i18n](https://github.com/ruby-i18n/i18n) from 1.8.5 to 1.8.9.
- [Release notes](https://github.com/ruby-i18n/i18n/releases)
- [Changelog](https://github.com/ruby-i18n/i18n/blob/master/CHANGELOG.md)
- [Commits](ruby-i18n/i18n@v1.8.5...v1.8.9)

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -264,7 +264,7 @@ GEM
       tilt
     hashdiff (1.0.1)
     highline (2.0.3)
-    i18n (1.8.5)
+    i18n (1.8.9)
       concurrent-ruby (~> 1.0)
     i18n-js (3.8.1)
       i18n (>= 0.6.6)