build(deps-dev): bump webrick from 1.8.1 to 1.9.1

Bumps [webrick](https://github.com/ruby/webrick) from 1.8.1 to 1.9.1.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.8.1...v1.9.1)

---
updated-dependencies:
- dependency-name: webrick
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -67,7 +67,7 @@ GEM
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     unicode-display_width (2.5.0)
-    webrick (1.8.1)
+    webrick (1.9.1)
 
 PLATFORMS
   ruby