build(deps): bump activesupport from 6.0.3.7 to 6.0.4 in /docs

Bumps [activesupport](https://github.com/rails/rails) from 6.0.3.7 to 6.0.4.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v6.1.4/activesupport/CHANGELOG.md)
- [Commits](https://github.com/rails/rails/compare/v6.0.3.7...v6.0.4)

---
updated-dependencies:
- dependency-name: activesupport
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

docs/Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (6.0.3.7)
+    activesupport (6.0.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -17,7 +17,7 @@ GEM
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
     concurrent-ruby (1.1.9)
-    dnsruby (1.61.6)
+    dnsruby (1.61.7)
       simpleidn (~> 0.1)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)