Bump redcarpet from 3.5.0 to 3.5.1

Bumps [redcarpet](https://github.com/vmg/redcarpet) from 3.5.0 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@v3.5.0...v3.5.1)

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

Author: dependabot[bot]

Gemfile.lock

@@ -176,7 +176,7 @@ GEM
     os (1.0.1)
     plist (3.5.0)
     public_suffix (2.0.5)
-    redcarpet (3.5.0)
+    redcarpet (3.5.1)
     representable (3.0.4)
       declarative (< 0.1.0)
       declarative-option (< 0.2.0)