chore(deps): update nextjs monorepo to v15 (major) (#131)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[eslint-config-next](https://nextjs.org/docs/app/building-your-application/configuring/eslint#eslint-config)
([source](https://redirect.github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next))
| [`^14.2.15` ->
`^15.0.0`](https://renovatebot.com/diffs/npm/eslint-config-next/14.2.15/15.0.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/eslint-config-next/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/eslint-config-next/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/eslint-config-next/14.2.15/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/eslint-config-next/14.2.15/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
| [next](https://nextjs.org)
([source](https://redirect.github.com/vercel/next.js)) | [`^14.2.15` ->
`^15.0.0`](https://renovatebot.com/diffs/npm/next/14.2.15/15.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/next/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/next/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/next/14.2.15/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/next/14.2.15/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>vercel/next.js (eslint-config-next)</summary>

###
[`v15.0.0`](https://redirect.github.com/vercel/next.js/compare/v14.2.15...v15.0.0)

[Compare
Source](https://redirect.github.com/vercel/next.js/compare/v14.2.15...v15.0.0)

</details>

<details>
<summary>vercel/next.js (next)</summary>

###
[`v15.0.0`](https://redirect.github.com/vercel/next.js/compare/v14.2.15...v15.0.0)

[Compare
Source](https://redirect.github.com/vercel/next.js/compare/v14.2.15...v15.0.0)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "before 4am on Monday" in timezone
Europe/Amsterdam, Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about these
updates again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/remcolakens/next-boilerplate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC4xMjAuMSIsInVwZGF0ZWRJblZlciI6IjM4LjEyMC4xIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

package.json

@@ -45,7 +45,7 @@
 		"babel-jest": "^29.7.0",
 		"commitizen": "^4.3.1",
 		"eslint": "^8.57.1",
-		"eslint-config-next": "^14.2.15",
+		"eslint-config-next": "^15.0.0",
 		"eslint-config-prettier": "^9.1.0",
 		"eslint-plugin-prettier": "5.2.1",
 		"eslint-plugin-react": "^7.37.1",
@@ -70,7 +70,7 @@
 		"class-variance-authority": "^0.7.0",
 		"clsx": "^2.1.1",
 		"lucide-react": "^0.453.0",
-		"next": "^14.2.15",
+		"next": "^15.0.0",
 		"react": "^18.3.1",
 		"react-dom": "^18.3.1",
 		"react-use": "^17.5.1",