Migrate shakapacker from 7.2.3 to 8.0.0

Bumps [shakapacker](https://github.com/shakacode/shakapacker) from 7.2.3 to 8.0.0.
- [Changelog](https://github.com/shakacode/shakapacker/blob/main/CHANGELOG.md)
- [Commits](https://github.com/shakacode/shakapacker/compare/v7.2.3...v8.0.0)

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

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

Gemfile.lock

@@ -475,7 +475,7 @@ GEM
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
     set (1.1.0)
-    shakapacker (7.2.3)
+    shakapacker (8.0.0)
       activesupport (>= 5.2)
       package_json
       rack-proxy (>= 0.6.1)
@@ -639,7 +639,7 @@ DEPENDENCIES
   selenium-webdriver
   sentry-rails
   sentry-ruby
-  shakapacker (= 7.2.3)
+  shakapacker (= 8.0.0)
   shoulda-matchers
   simplecov
   slim-rails