Update dependency gatsby to v4 [SECURITY]

Author: renovate[bot]

package.json

@@ -16,7 +16,7 @@
     "bulma": "0.9.3",
     "classnames": "2.3.1",
     "feed": "4.2.2",
-    "gatsby": "3.8.1",
+    "gatsby": "4.25.7",
     "gatsby-background-image": "1.5.3",
     "gatsby-image": "3.8.0",
     "gatsby-plugin-catch-links": "3.8.0",