Bump strong_migrations from 1.6.0 to 1.6.1 (#499)

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 1.6.0 to 1.6.1.
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](ankane/strong_migrations@v1.6.0...v1.6.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -304,7 +304,7 @@ GEM
       rubocop-performance (~> 1.18.0)
     stimulus-rails (1.2.2)
       railties (>= 6.0.0)
-    strong_migrations (1.6.0)
+    strong_migrations (1.6.1)
       activerecord (>= 5.2)
     thor (1.2.2)
     timeout (0.4.0)