chore(deps): bump shell-quote to >=1.8.4 via pnpm override (#4991)

Resolves critical CVE in shell-quote — quote() did not escape newlines
in object .op values, allowing shell injection. Fixed in 1.8.4.
Transitive dev dep via @docusaurus/core → webpack-dev-server → launch-editor@2.13.2.

Author: millus

package.json

@@ -114,7 +114,8 @@
       "js-yaml": ">=4.1.1",
       "gray-matter>js-yaml": "^3.14.1",
       "lodash": ">=4.18.0",
-      "webpackbar": "^7.0.0"
+      "webpackbar": "^7.0.0",
+      "shell-quote": ">=1.8.4"
     }
   }
 }