Bump redcarpet from 3.2.3 to 3.5.1 (#380)

Bumps [redcarpet](https://github.com/vmg/redcarpet) from 3.2.3 to 3.5.1.
- [Release notes](https://github.com/vmg/redcarpet/releases)
- [Changelog](https://github.com/vmg/redcarpet/blob/master/CHANGELOG.md)
- [Commits](vmg/redcarpet@v3.2.3...v3.5.1)

---
updated-dependencies:
- dependency-name: redcarpet
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -106,7 +106,7 @@ GEM
     rb-fsevent (0.9.4)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)
-    redcarpet (3.2.3)
+    redcarpet (3.5.1)
     redis (4.0.3)
     redis-namespace (1.6.0)
       redis (>= 3.0.4)