Bump strong_migrations from 1.4.4 to 1.6.4

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 1.4.4 to 1.6.4.
- [Changelog](https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md)
- [Commits](ankane/strong_migrations@v1.4.4...v1.6.4)

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

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

Gemfile.lock

@@ -278,7 +278,7 @@ GEM
     mini_portile2 (2.8.4)
     mini_racer (0.6.3)
       libv8-node (~> 16.10.0.0)
-    minitest (5.19.0)
+    minitest (5.20.0)
     mock_redis (0.36.0)
       ruby2_keywords
     multi_json (1.15.0)
@@ -485,7 +485,7 @@ GEM
     standby (4.0.0)
       activerecord (>= 3.0.0)
     stringex (2.8.6)
-    strong_migrations (1.4.4)
+    strong_migrations (1.6.4)
       activerecord (>= 5.2)
     ten_years_rails (0.2.0)
       actionview
@@ -516,7 +516,7 @@ GEM
     websocket-extensions (0.1.5)
     yard (0.9.27)
       webrick (~> 1.7.0)
-    zeitwerk (2.6.10)
+    zeitwerk (2.6.12)
     zoo_stream (1.0.1)
       aws-sdk