Update dependency gatsby-plugin-sharp to v4 [SECURITY]

Author: renovate[bot]

package.json

@@ -15,7 +15,7 @@
     "gatsby-plugin-manifest": "^2.4.22",
     "gatsby-plugin-offline": "^3.2.22",
     "gatsby-plugin-react-helmet": "^3.3.10",
-    "gatsby-plugin-sharp": "^2.6.27",
+    "gatsby-plugin-sharp": "^4.0.0",
     "gatsby-source-filesystem": "^2.3.24",
     "gatsby-transformer-sharp": "^2.5.12",
     "prop-types": "^15.7.2",