fix(deps): update starters and examples - gatsby (#36396)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

starters/blog/package-lock.json

@@ -8,19 +8,19 @@
     "url": "https://github.com/gatsbyjs/gatsby/issues"
   },
   "dependencies": {
-    "gatsby": "^4.20.0",
-    "gatsby-plugin-feed": "^4.20.0",
-    "gatsby-plugin-image": "^2.20.0",
-    "gatsby-plugin-manifest": "^4.20.0",
-    "gatsby-plugin-sharp": "^4.20.0",
-    "gatsby-remark-copy-linked-files": "^5.20.0",
-    "gatsby-remark-images": "^6.20.0",
-    "gatsby-remark-prismjs": "^6.20.0",
-    "gatsby-remark-responsive-iframe": "^5.20.0",
-    "gatsby-remark-smartypants": "^5.20.0",
-    "gatsby-source-filesystem": "^4.20.0",
-    "gatsby-transformer-remark": "^5.20.0",
-    "gatsby-transformer-sharp": "^4.20.0",
+    "gatsby": "^4.21.0",
+    "gatsby-plugin-feed": "^4.21.0",
+    "gatsby-plugin-image": "^2.21.0",
+    "gatsby-plugin-manifest": "^4.21.0",
+    "gatsby-plugin-sharp": "^4.21.0",
+    "gatsby-remark-copy-linked-files": "^5.21.0",
+    "gatsby-remark-images": "^6.21.0",
+    "gatsby-remark-prismjs": "^6.21.0",
+    "gatsby-remark-responsive-iframe": "^5.21.0",
+    "gatsby-remark-smartypants": "^5.21.0",
+    "gatsby-source-filesystem": "^4.21.0",
+    "gatsby-transformer-remark": "^5.21.0",
+    "gatsby-transformer-sharp": "^4.21.0",
     "prismjs": "^1.28.0",
     "react": "^18.1.0",
     "react-dom": "^18.1.0",