chore(deps): bump next from 15.3.3 to 15.4.8 in /js (#3894)

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Author: dependabot[bot]

js/plugins/next/package.json

@@ -43,7 +43,7 @@
     "@types/node": "^20.11.16",
     "genkit": "workspace:*",
     "jest": "^29.7.0",
-    "next": "^15.2.4",
+    "next": "^15.4.8",
     "npm-run-all": "^4.1.5",
     "rimraf": "^6.0.1",
     "ts-jest": "^29.1.2",