fix(deps): update nextjs monorepo to v15.4.0-canary.60

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-config-next (source)	15.4.0-canary.59 -> 15.4.0-canary.60
next (source)	15.4.0-canary.59 -> 15.4.0-canary.60

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Release Notes

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

v15.4.0-canary.60

Compare Source

Core Changes

• [devtools] Add a query parameter to restart endpoint to invalidate the persistent cache: #​79425
• Implement handler interface for app-page: #​79568
• Migrate app route to handler interface: #​80008
• Turbopack Build: Fix underscore path tests: #​79778
• Fix watchmode for taskr tasks: #​80020

Misc Changes

• fix: update rspack production build output snapshot: #​79766

Credits

Huge thanks to @​SyMind, @​bgw, @​ijjk, @​timneutkens, and @​eps1lon for helping!

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