build(deps): bump webrick from 1.9.0 to 1.9.1 in /assets/service_broker

Bumps [webrick](https://github.com/ruby/webrick) from 1.9.0 to 1.9.1.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.9.0...v1.9.1)

---
updated-dependencies:
- dependency-name: webrick
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

assets/service_broker/Gemfile.lock

@@ -41,7 +41,7 @@ GEM
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
     tilt (2.4.0)
-    webrick (1.9.0)
+    webrick (1.9.1)
 
 PLATFORMS
   ruby