⬆️ Update WillowSword gem

This commit will bring in hardening fixes the client brought to light.

Ref:
- #686

Author: kirkkwang

bundler.d/example.rb

@@ -9,4 +9,4 @@
 ensure_gem "sentry-ruby"
 ensure_gem "sentry-rails"
 ensure_gem "cancancan", "~> 3.0" # cancancan is bundling to v1.17.0 but we need at least 3.0
-override_gem "willow_sword", github: "notch8/willow_sword", tag: "v0.9.0"
+override_gem "willow_sword", github: "notch8/willow_sword", tag: "v0.9.1"