Merge pull request sfall-team#631 from sfall-team/dependabot/bundler/docs/concurrent-ruby-1.3.7

Bump concurrent-ruby from 1.3.6 to 1.3.7 in /docs

Author: NovaRain

docs/Gemfile.lock

@@ -16,7 +16,7 @@ GEM
     coffee-script-source (1.11.1)
     colorator (1.1.0)
     commonmarker (0.23.12)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     dnsruby (1.72.3)
       base64 (~> 0.2.0)
       simpleidn (~> 0.2.1)