fix(deps): update dependency mintlify to v4.2.280

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mintlify	4.2.275 → 4.2.280

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Summary by cubic

Upgraded Mintlify in the docs app to v4.2.280 to pull in the latest CLI/preview fixes and improvements for local docs tooling.

• Dependencies
  • mintlify: 4.2.275 → 4.2.280
  • Transitive updates: @mintlify/cli 4.0.884, @mintlify/prebuild 1.0.801, @mintlify/previewing 4.0.857, @mintlify/link-rot 3.0.823

^{Written for commit efbf0e3. Summary will update on new commits.}

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