Bump webrick from 1.4.2 to 1.8.1

Bumps [webrick](https://github.com/ruby/webrick) from 1.4.2 to 1.8.1.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.4.2...v1.8.1)

---
updated-dependencies:
- dependency-name: webrick
  dependency-type: indirect
...

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

Gemfile.lock

@@ -189,7 +189,7 @@ GEM
       unf_ext
     unf_ext (0.0.7.5)
     unicode-display_width (1.4.0)
-    webrick (1.4.2)
+    webrick (1.8.1)
     word_wrap (1.0.0)
     xcodeproj (1.19.0)
       CFPropertyList (>= 2.3.3, < 4.0)