Bump redcarpet in /pkg/mod/github.com/hashicorp/serf@v0.8.2/website

Bumps [redcarpet](https://github.com/vmg/redcarpet) from 3.4.0 to 3.5.1.
- [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/v3.4.0...v3.5.1)
Signed-off-by: Ndependabot[bot] <support@github.com>

pkg/mod/github.com/hashicorp/serf@v0.8.2/website/Gemfile.lock

@@ -120,7 +120,7 @@ GEM
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
-    redcarpet (3.4.0)
+    redcarpet (3.5.1)
     rouge (2.2.1)
     sass (3.4.25)
     sprockets (2.12.4)