fix(deps): update gatsby monorepo

Author: renovate-bot

package.json

@@ -5,14 +5,14 @@
   "author": "Shifter Team <[email protected]>",
   "dependencies": {
     "bootstrap": "^4.4.1",
-    "gatsby": "^2.20.27",
+    "gatsby": "^4.0.0",
     "gatsby-awesome-pagination": "^0.3.5",
-    "gatsby-link": "^2.3.4",
-    "gatsby-plugin-manifest": "^2.3.6",
-    "gatsby-plugin-offline": "^3.1.4",
-    "gatsby-plugin-react-helmet": "^3.2.4",
-    "gatsby-plugin-typescript": "^2.3.3",
-    "gatsby-source-wordpress": "^3.2.5",
+    "gatsby-link": "^4.0.0",
+    "gatsby-plugin-manifest": "^4.0.0",
+    "gatsby-plugin-offline": "^5.0.0",
+    "gatsby-plugin-react-helmet": "^5.0.0",
+    "gatsby-plugin-typescript": "^4.0.0",
+    "gatsby-source-wordpress": "^6.0.0",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-github-ribbons": "^0.2.2",