Bump cssbundling-rails from 1.2.0 to 1.3.3 (#523)

Bumps [cssbundling-rails](https://github.com/rails/cssbundling-rails) from 1.2.0 to 1.3.3.
- [Release notes](https://github.com/rails/cssbundling-rails/releases)
- [Commits](rails/cssbundling-rails@v1.2.0...v1.3.3)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -102,7 +102,7 @@ GEM
     concurrent-ruby (1.2.2)
     connection_pool (2.4.1)
     crass (1.0.6)
-    cssbundling-rails (1.2.0)
+    cssbundling-rails (1.3.3)
       railties (>= 6.0.0)
     cuprite (0.14.3)
       capybara (~> 3.0)