Update dependency gh-pages to v3 (#85)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

packages/web_sandbox/package.json

@@ -25,7 +25,7 @@
     "@types/webpack-dev-server": "^3.1.1",
     "css-loader": "^3.0.0",
     "fast-check": "^1.5.0",
-    "gh-pages": "^2.0.1",
+    "gh-pages": "^3.0.0",
     "node-sass": "^4.12.0",
     "postcss-loader": "^3.0.0",
     "prettier": "^1.13.7",

yarn.lock

@@ -5041,19 +5041,17 @@ getpass@^0.1.1:
   dependencies:
     assert-plus "^1.0.0"
 
-gh-pages@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/gh-pages/-/gh-pages-2.0.1.tgz#aefe47a43b8d9d2aa3130576b33fe95641e29a2f"
-  integrity sha512-uFlk3bukljeiWKQ2XvPfjcSi/ou7IfoDf2p+Fj672saLAr8bnOdFVqI/JSgrSgInKpCg5BksxEwGUl++dbg8Dg==
+gh-pages@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/gh-pages/-/gh-pages-3.0.0.tgz#65f3ccd424bfbc7906f31c4bdb524a1147fa8da2"
+  integrity sha512-oaOfVcrSwnqoWUgZ6cmCDM6mUuWyOSG+SHjqxGBawN0F3SKaF5NwbeYDG+w2RNXO2HJ/5Iam4o7dP5NAtoHuwQ==
   dependencies:
     async "^2.6.1"
     commander "^2.18.0"
     email-addresses "^3.0.1"
     filenamify-url "^1.0.0"
-    fs-extra "^7.0.0"
+    fs-extra "^8.1.0"
     globby "^6.1.0"
-    graceful-fs "^4.1.11"
-    rimraf "^2.6.2"
 
 git-raw-commits@2.0.0:
   version "2.0.0"