Bump strong_migrations from 0.2.3 to 0.3.0 (#8991)

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 0.2.3 to 0.3.0.
- [Release notes](https://github.com/ankane/strong_migrations/releases)
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/strong_migrations/compare/v0.2.3...v0.3.0)

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

Gemfile.lock

@@ -269,7 +269,7 @@ GEM
     httplog (1.1.1)
       rack (>= 1.0)
       rainbow (>= 2.0.0)
-    i18n (1.1.0)
+    i18n (1.1.1)
       concurrent-ruby (~> 1.0)
     i18n-tasks (0.9.25)
       activesupport (>= 4.0.2)
@@ -585,7 +585,7 @@ GEM
     stoplight (2.1.3)
     streamio-ffmpeg (3.0.2)
       multi_json (~> 1.8)
-    strong_migrations (0.2.3)
+    strong_migrations (0.3.0)
       activerecord (>= 3.2.0)
     temple (0.8.0)
     terminal-table (1.8.0)
@@ -752,7 +752,7 @@ DEPENDENCIES
   stackprof
   stoplight (~> 2.1.3)
   streamio-ffmpeg (~> 3.0)
-  strong_migrations (~> 0.2)
+  strong_migrations (~> 0.3)
   thor (~> 0.20)
   tty-command (~> 0.8)
   tty-prompt (~> 0.17)