Bump cgi from 0.3.6 to 0.3.7

Bumps [cgi](https://github.com/ruby/cgi) from 0.3.6 to 0.3.7.
- [Release notes](https://github.com/ruby/cgi/releases)
- [Commits](https://github.com/ruby/cgi/compare/v0.3.6...v0.3.7)

---
updated-dependencies:
- dependency-name: cgi
  dependency-version: 0.3.7
  dependency-type: indirect
...

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

Gemfile.lock

@@ -226,7 +226,7 @@ GEM
       marcel (~> 1.0)
       nokogiri (~> 1.10, >= 1.10.4)
       rubyzip (>= 1.3.0, < 3)
-    cgi (0.3.6)
+    cgi (0.3.7)
     childprocess (5.0.0)
     choice (0.2.0)
     chronic (0.10.2)