fix(deps): update dependency gh-pages to v5 [security]

Author: renovate[bot]

package.json

@@ -23,7 +23,7 @@
     "eslint-plugin-import": "2.18.2",
     "eslint-plugin-prettier": "2.7.0",
     "fragments.css": "1.0.49-alpha",
-    "gh-pages": "1.2.0",
+    "gh-pages": "5.0.0",
     "glob": "7.1.4",
     "gulp": "3.9.1",
     "gulp-autoprefixer": "5.0.0",