fix(deps): update gatsby

Author: renovate[bot]

gatsby/package.json

@@ -11,13 +11,13 @@
     "final-form": "^4.20.2",
     "gatsby": "3.9.1",
     "gatsby-image": "3.9.0",
-    "gatsby-plugin-manifest": "3.9.0",
-    "gatsby-plugin-offline": "4.9.0",
-    "gatsby-plugin-postcss": "4.9.0",
-    "gatsby-plugin-react-helmet": "4.9.0",
+    "gatsby-plugin-manifest": "5.12.3",
+    "gatsby-plugin-offline": "6.12.3",
+    "gatsby-plugin-postcss": "6.12.0",
+    "gatsby-plugin-react-helmet": "6.12.0",
     "gatsby-plugin-sharp": "3.9.0",
-    "gatsby-source-filesystem": "3.9.0",
-    "gatsby-transformer-sharp": "3.9.0",
+    "gatsby-source-filesystem": "5.12.1",
+    "gatsby-transformer-sharp": "5.12.3",
     "postcss": "^8.2.8",
     "prop-types": "^15.7.2",
     "react": "17.0.2",