Bump stripe from 8.7.0 to 12.6.0

Bumps [stripe](https://github.com/stripe/stripe-ruby) from 8.7.0 to 12.6.0.
- [Release notes](https://github.com/stripe/stripe-ruby/releases)
- [Changelog](https://github.com/stripe/stripe-ruby/blob/master/CHANGELOG.md)
- [Commits](stripe/stripe-ruby@v8.7.0...v12.6.0)

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

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

Gemfile.lock

@@ -489,7 +489,7 @@ GEM
       railties (>= 6.0.0)
     stringex (2.8.6)
     stringio (3.1.1)
-    stripe (8.7.0)
+    stripe (12.6.0)
     thor (1.3.2)
     tilt (2.4.0)
     timeout (0.4.1)