fix(deps): update nextjs monorepo to v15.0.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@next/env (source)	15.0.2 -> 15.0.3
@next/mdx (source)	15.0.2 -> 15.0.3
eslint-config-next (source)	15.0.2 -> 15.0.3
next (source)	15.0.2 -> 15.0.3

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Release Notes

vercel/next.js (@​next/env)

### [`v15.0.3`](https://redirect.github.com/vercel/next.js/compare/v15.0.2...v15.0.3) [Compare Source](https://redirect.github.com/vercel/next.js/compare/v15.0.2...v15.0.3)

vercel/next.js (@​next/mdx)

### [`v15.0.3`](https://redirect.github.com/vercel/next.js/compare/v15.0.2...v15.0.3) [Compare Source](https://redirect.github.com/vercel/next.js/compare/v15.0.2...v15.0.3)

vercel/next.js (eslint-config-next)

### [`v15.0.3`](https://redirect.github.com/vercel/next.js/compare/v15.0.2...v15.0.3) [Compare Source](https://redirect.github.com/vercel/next.js/compare/v15.0.2...v15.0.3)

vercel/next.js (next)

### [`v15.0.3`](https://redirect.github.com/vercel/next.js/compare/v15.0.2...v15.0.3) [Compare Source](https://redirect.github.com/vercel/next.js/compare/v15.0.2...v15.0.3)

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[AleksandarDev]

:tada: This PR is included in version 1.175.0-next.1 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket:

[AleksandarDev]

:tada: This PR is included in version 1.175.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: