fix(deps): update dependency gatsby to v4 [security]

Author: renovate[bot]

package.json

@@ -5,7 +5,7 @@
   "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",