build(deps): bump typhoeus from 1.3.1 to 1.4.0 in /docs

Bumps [typhoeus](https://github.com/typhoeus/typhoeus) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/typhoeus/typhoeus/releases)
- [Changelog](https://github.com/typhoeus/typhoeus/blob/master/CHANGELOG.md)
- [Commits](https://github.com/typhoeus/typhoeus/compare/v1.3.1...v1.4.0

)

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

docs/Gemfile.lock

@@ -244,7 +244,7 @@ GEM
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     thread_safe (0.3.6)
-    typhoeus (1.3.1)
+    typhoeus (1.4.0)
       ethon (>= 0.9.0)
     tzinfo (1.2.7)
       thread_safe (~> 0.1)