Bump highlight.js from 9.12.0 to 9.18.5

Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 9.12.0 to 9.18.5.
- [Release notes](https://github.com/highlightjs/highlight.js/releases)
- [Changelog](https://github.com/highlightjs/highlight.js/blob/9.18.5/CHANGES.md)
- [Commits](highlightjs/highlight.js@9.12.0...9.18.5)

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

yarn.lock

@@ -777,8 +777,8 @@ has-flag@^1.0.0:
   resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-1.0.0.tgz#9d9e793165ce017a00f00418c43f942a7b1d11fa"
 
 highlight.js@^9.0.0:
-  version "9.12.0"
-  resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-9.12.0.tgz#e6d9dbe57cbefe60751f02af336195870c90c01e"
+  version "9.18.5"
+  resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-9.18.5.tgz#d18a359867f378c138d6819edfc2a8acd5f29825"
 
 home-or-tmp@^2.0.0:
   version "2.0.0"