Bump unified from 8.4.1 to 8.4.2 (#6927)

Bumps [unified](https://github.com/unifiedjs/unified) from 8.4.1 to 8.4.2.
- [Release notes](https://github.com/unifiedjs/unified/releases)
- [Changelog](https://github.com/unifiedjs/unified/blob/master/changelog.md)
- [Commits](unifiedjs/unified@8.4.1...8.4.2)

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

package.json

@@ -69,7 +69,7 @@
     "string-width": "4.1.0",
     "typescript": "3.7.2",
     "unicode-regex": "3.0.0",
-    "unified": "8.4.1",
+    "unified": "8.4.2",
     "vnopts": "1.0.2",
     "yaml-unist-parser": "1.1.1"
   },

yarn.lock

@@ -6896,10 +6896,10 @@ unicode-regex@^2.0.0:
   dependencies:
     regexp-util "^1.2.0"
 
-unified@8.4.1:
-  version "8.4.1"
-  resolved "https://registry.yarnpkg.com/unified/-/unified-8.4.1.tgz#99bd0393f58a139eaa51832cfbcc0e7f6573a1e1"
-  integrity sha512-YPj/uIIZSO7mMIZQj/5Z3hDl4lshWYRQGs5TgUCjHTVdklUWH+O94mK5Cy77SEcmEUwGhnUcudMuH/zIwporqw==
+unified@8.4.2:
+  version "8.4.2"
+  resolved "https://registry.yarnpkg.com/unified/-/unified-8.4.2.tgz#13ad58b4a437faa2751a4a4c6a16f680c500fff1"
+  integrity sha512-JCrmN13jI4+h9UAyKEoGcDZV+i1E7BLFuG7OsaDvTXI5P0qhHX+vZO/kOhz9jn8HGENDKbwSeB0nVOg4gVStGA==
   dependencies:
     bail "^1.0.0"
     extend "^3.0.0"