Bump stripe from 15.2.1 to 15.3.0 (#2445)

---
updated-dependencies:
- dependency-name: stripe
  dependency-version: 15.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Gemfile.lock

@@ -556,7 +556,7 @@ GEM
     stimulus-rails (1.3.4)
       railties (>= 6.0.0)
     stringio (3.1.7)
-    stripe (15.2.1)
+    stripe (15.3.0)
     tailwindcss-rails (4.2.3)
       railties (>= 7.0.0)
       tailwindcss-ruby (~> 4.0)