Update dependency next to v13.4.18

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
next (source)	13.4.17 -> 13.4.18

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Release Notes

vercel/next.js (next)

v13.4.18

Compare Source

Core Changes

• refactor: remove edge condition for module proxy path: #​54167
• Remove unused variables: #​54149
• chore: improve ts types for position in dev-build-watcher: #​54124
• Turbopack: Strip relative path prefix when generating PageLoaderAsset: #​54040
• Add size property to ReadonlySearchParams: #​53144
• Assign default not-found boundary if custom not-found is not present for root layer only: #​54185
• Allow range version for eslint config: #​53751
• Automatically modularizeImports for the popular @​headlessui/react library: #​54188
• fix bfcache restoration behavior: #​54198

Misc Changes

• Update rust toolchain: #​54130

Credits

Huge thanks to @​huozhi, @​shuding, @​styfle, @​jridgewell, @​bencmbrook, @​cramforce, and @​ztanner for helping!

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