Bump strong_migrations from 1.4.4 to 2.1.0

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 1.4.4 to 2.1.0.
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](ankane/strong_migrations@v1.4.4...v2.1.0)

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

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

Gemfile.lock

@@ -485,8 +485,8 @@ GEM
     standby (4.0.0)
       activerecord (>= 3.0.0)
     stringex (2.8.6)
-    strong_migrations (1.4.4)
-      activerecord (>= 5.2)
+    strong_migrations (2.1.0)
+      activerecord (>= 6.1)
     ten_years_rails (0.2.0)
       actionview
       activesupport
@@ -514,7 +514,7 @@ GEM
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
     yard (0.9.36)
-    zeitwerk (2.6.18)
+    zeitwerk (2.7.1)
     zoo_stream (1.0.1)
       aws-sdk