chore: upgrade to next 15

Author: mrstork

e2e-report/data/test-results.json

@@ -8528,7 +8528,7 @@
           "link": "https://github.com/netlify/next-runtime-minimal/issues/564"
         },
         {
-          "name": "skip-trailing-slash-redirect should be able to redirect locale casing $1",
+          "name": "skip-trailing-slash-redirect should be able to redirect locale casing $2",
           "status": "failed",
           "retries": 0,
           "reason": "does not correctly handle user middleware that redirects to path with canonical locale casing when app enables `skipMiddlewareUrlNormalize` and path contains locale slug with non-canonical casing",

e2e-report/next.config.mjs

@@ -1,4 +1,6 @@
 /** @type {import('next').NextConfig} */
-const nextConfig = {}
+const nextConfig = {
+  outputFileTracingRoot: import.meta.dirname,
+}
 
 export default nextConfig