Bump stripe from 10.8.0 to 10.9.0 (#2213)

Author: dependabot[bot]

Gemfile.lock

@@ -499,7 +499,7 @@ GEM
     stringio (3.1.0)
     strip_attributes (1.13.0)
       activemodel (>= 3.0, < 8.0)
-    stripe (10.8.0)
+    stripe (10.9.0)
     strong_migrations (1.7.0)
       activerecord (>= 5.2)
     thor (1.3.0)