fix(deps): update gatsby monorepo

Author: renovate[bot]

package.json

@@ -8,20 +8,20 @@
     "@fortawesome/react-fontawesome": "0.2.2",
     "classnames": "2.5.1",
     "date-fns": "4.1.0",
-    "gatsby": "5.14.4",
+    "gatsby": "5.15.0",
     "gatsby-plugin-fix-fouc": "1.1.2",
-    "gatsby-plugin-image": "3.14.0",
-    "gatsby-plugin-manifest": "5.14.0",
-    "gatsby-plugin-no-sourcemaps": "5.14.0",
-    "gatsby-plugin-sharp": "5.14.0",
-    "gatsby-plugin-sitemap": "6.14.0",
-    "gatsby-plugin-styled-jsx": "6.14.0",
-    "gatsby-remark-copy-linked-files": "6.14.0",
-    "gatsby-remark-images": "7.14.0",
-    "gatsby-remark-prismjs": "7.14.0",
-    "gatsby-source-filesystem": "5.14.0",
-    "gatsby-transformer-remark": "6.14.0",
-    "gatsby-transformer-sharp": "5.14.0",
+    "gatsby-plugin-image": "3.15.0",
+    "gatsby-plugin-manifest": "5.15.0",
+    "gatsby-plugin-no-sourcemaps": "5.15.0",
+    "gatsby-plugin-sharp": "5.15.0",
+    "gatsby-plugin-sitemap": "6.15.0",
+    "gatsby-plugin-styled-jsx": "6.15.0",
+    "gatsby-remark-copy-linked-files": "6.15.0",
+    "gatsby-remark-images": "7.15.0",
+    "gatsby-remark-prismjs": "7.15.0",
+    "gatsby-source-filesystem": "5.15.0",
+    "gatsby-transformer-remark": "6.15.0",
+    "gatsby-transformer-sharp": "5.15.0",
     "prismjs": "1.30.0",
     "prop-types": "15.8.1",
     "react": "18.3.1",