Bump strong_migrations from 1.6.2 to 1.6.3

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 1.6.2 to 1.6.3.
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](ankane/strong_migrations@v1.6.2...v1.6.3)

---
updated-dependencies:
- dependency-name: strong_migrations
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -457,7 +457,7 @@ GEM
     strip_attributes (1.13.0)
       activemodel (>= 3.0, < 8.0)
     stripe (9.3.0)
-    strong_migrations (1.6.2)
+    strong_migrations (1.6.3)
       activerecord (>= 5.2)
     thor (1.2.2)
     timeout (0.3.2)