Bump the next-js group across 1 directory with 2 updates

Bumps the next-js group with 2 updates in the / directory: [next](https://github.com/vercel/next.js) and [@next/eslint-plugin-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-plugin-next).


Updates `next` from 14.2.15 to 15.1.3
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.15...v15.1.3)

Updates `@next/eslint-plugin-next` from 14.2.15 to 15.1.3
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v15.1.3/packages/eslint-plugin-next)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: next-js
- dependency-name: "@next/eslint-plugin-next"
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: next-js
...

Signed-off-by: dependabot[bot] <[email protected]>

apps/cache-testing/package.json

@@ -17,13 +17,13 @@
     "dependencies": {
         "@neshca/cache-handler": "*",
         "axios": "1.7.8",
-        "next": "14.2.15",
+        "next": "15.1.3",
         "react": "18.3.1",
         "react-dom": "18.3.1",
         "redis": "4.7.0"
     },
     "devDependencies": {
-        "@next/eslint-plugin-next": "14.2.15",
+        "@next/eslint-plugin-next": "15.1.3",
         "@playwright/test": "1.49.0",
         "@repo/eslint-config": "*",
         "@repo/typescript-config": "*",

docs/cache-handler-docs/package.json

@@ -11,14 +11,14 @@
         "start:docs": "serve out"
     },
     "dependencies": {
-        "next": "14.2.15",
+        "next": "15.1.3",
         "nextra": "3.2.4",
         "nextra-theme-docs": "3.2.4",
         "react": "18.3.1",
         "react-dom": "18.3.1"
     },
     "devDependencies": {
-        "@next/eslint-plugin-next": "14.2.15",
+        "@next/eslint-plugin-next": "15.1.3",
         "@repo/eslint-config": "*",
         "@repo/typescript-config": "*",
         "@types/eslint": "8.56.12",

internal/next-common/package.json

@@ -8,7 +8,7 @@
         "types": "./src/next-common.ts"
     },
     "dependencies": {
-        "next": "14.2.15"
+        "next": "15.1.3"
     },
     "devDependencies": {
         "@repo/typescript-config": "*",