Bump stripe from 12.3.0 to 12.4.0

Bumps [stripe](https://github.com/stripe/stripe-ruby) from 12.3.0 to 12.4.0.
- [Release notes](https://github.com/stripe/stripe-ruby/releases)
- [Changelog](https://github.com/stripe/stripe-ruby/blob/master/CHANGELOG.md)
- [Commits](stripe/stripe-ruby@v12.3.0...v12.4.0)

---
updated-dependencies:
- dependency-name: stripe
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -313,7 +313,7 @@ GEM
       sprockets (>= 3.0.0)
     sqlite3 (1.7.3)
       mini_portile2 (~> 2.8.0)
-    stripe (12.3.0)
+    stripe (12.4.0)
     strscan (3.1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)