chore(deps-dev): bump gh-pages from 3.1.0 to 6.3.0 (#186)

Author: dependabot[bot]

package.json

@@ -52,7 +52,7 @@
     "eslint-config-airbnb-base": "15.0.0",
     "eslint-plugin-header": "3.0.0",
     "eslint-plugin-import": "2.22.0",
-    "gh-pages": "3.1.0",
+    "gh-pages": "6.3.0",
     "gts": "3.1.1",
     "husky": "4.2.5",
     "lerna": "3.22.1",