Bump cgi from 0.4.1 to 0.4.2 in /docs

Bumps [cgi](https://github.com/ruby/cgi) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/ruby/cgi/releases)
- [Commits](ruby/cgi@v0.4.1...v0.4.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/Gemfile.lock

@@ -15,7 +15,7 @@ GEM
       public_suffix (>= 2.0.2, < 6.0)
     base64 (0.2.0)
     bigdecimal (3.1.8)
-    cgi (0.4.1)
+    cgi (0.4.2)
     colorator (1.1.0)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)