Bump shakapacker from 7.2.0.rc.0 to 7.2.1

Bumps [shakapacker](https://github.com/shakacode/shakapacker) from 7.2.0.rc.0 to 7.2.1.
- [Changelog](https://github.com/shakacode/shakapacker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/shakacode/shakapacker/commits)

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

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

Gemfile.lock

@@ -466,7 +466,7 @@ GEM
     sentry-ruby (5.15.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
     set (1.1.0)
-    shakapacker (7.2.0.rc.0)
+    shakapacker (7.2.1)
       activesupport (>= 5.2)
       package_json
       rack-proxy (>= 0.6.1)
@@ -626,7 +626,7 @@ DEPENDENCIES
   selenium-webdriver
   sentry-rails
   sentry-ruby
-  shakapacker (= 7.2.0.rc.0)
+  shakapacker (= 7.2.1)
   shoulda-matchers
   simplecov
   slim-rails