Upgrade Nextjs apphosting starter to Nextjs 15 (#247)

* Upgrade Nextjs apphosting starter to Nextjs 15

* Upgrade to next@15.0.0

* Ignore the starters folder in the root eslintrc.cjs file

* Bump eslint 9 for nextjs starter template

* Bump to next 15.0.0 for firebase-frameworks

* Use react 18 and next 15..0.0

* Use react 18 and next 15..0.0

Author: chalosalvador

.eslintrc.cjs

@@ -117,7 +117,5 @@ module.exports = {
     },
   },
   parser: "@typescript-eslint/parser",
-  ignorePatterns: [
-
-  ],
+  ignorePatterns: ["starters/**"],
 };