Bump redcarpet from 3.5.1 to 3.6.0

Bumps [redcarpet](https://github.com/vmg/redcarpet) from 3.5.1 to 3.6.0.
- [Release notes](https://github.com/vmg/redcarpet/releases)
- [Changelog](https://github.com/vmg/redcarpet/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vmg/redcarpet/compare/v3.5.1...v3.6.0)

---
updated-dependencies:
- dependency-name: redcarpet
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -482,7 +482,7 @@ GEM
     rbtree3 (0.7.0)
     recipient_interceptor (0.3.1)
       mail
-    redcarpet (3.5.1)
+    redcarpet (3.6.0)
     regexp_parser (2.8.1)
     request_store (1.5.1)
       rack (>= 1.4)
@@ -735,7 +735,7 @@ DEPENDENCIES
   rails (= 6.0.6.1)
   rails-assets-markdown-it (~> 9.0.1)!
   recipient_interceptor (~> 0.3.1)
-  redcarpet (~> 3.5.1)
+  redcarpet (~> 3.6.0)
   responders (~> 3.0.1)
   rinku (~> 2.0.6)
   ros-apartment (~> 2.11.0)