Bump github-markup from 4.0.1 to 4.0.2

Bumps [github-markup](https://github.com/github/markup) from 4.0.1 to 4.0.2.
- [Release notes](https://github.com/github/markup/releases)
- [Changelog](https://github.com/github/markup/blob/master/HISTORY.md)
- [Commits](github/markup@v4.0.1...v4.0.2)

---
updated-dependencies:
- dependency-name: github-markup
  dependency-version: 4.0.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -40,7 +40,7 @@ GEM
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
     ffi (1.15.5)
-    github-markup (4.0.1)
+    github-markup (4.0.2)
     hashdiff (1.1.2)
     hashie (5.0.0)
     http-accept (1.7.0)