Bump groupdate from 6.2.1 to 6.4.0

Bumps [groupdate](https://github.com/ankane/groupdate) from 6.2.1 to 6.4.0.
- [Changelog](https://github.com/ankane/groupdate/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/groupdate/compare/v6.2.1...v6.4.0)

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

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

Gemfile.lock

@@ -248,8 +248,8 @@ GEM
       railties
       sprockets-rails
     graphql (1.12.14)
-    groupdate (6.2.1)
-      activesupport (>= 5.2)
+    groupdate (6.4.0)
+      activesupport (>= 6.1)
     gyoku (1.4.0)
       builder (>= 2.1.2)
       rexml (~> 3.0)
@@ -718,7 +718,7 @@ DEPENDENCIES
   globalize-accessors (~> 0.3.0)
   graphiql-rails (~> 1.8.0)
   graphql (~> 1.12.14)
-  groupdate (~> 6.2.1)
+  groupdate (~> 6.4.0)
   i18n-tasks (~> 0.9.37)
   image_processing (~> 1.12.2)
   initialjs-rails (~> 0.2.0.9)