fix(deps): update dependency @netlify/cache-utils to v6

Author: renovate[bot]

packages/gatsby-adapter-netlify/package.json

@@ -32,7 +32,7 @@
   "homepage": "https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-adapter-netlify#readme",
   "dependencies": {
     "@babel/runtime": "^7.20.13",
-    "@netlify/cache-utils": "^5.1.5",
+    "@netlify/cache-utils": "^6.0.4",
     "@netlify/config": "^20.10.0",
     "@netlify/functions": "^1.6.0",
     "cookie": "^0.6.0",