chore(deps): update yarn to v4.18.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
yarn (source)	4.18.0 → 4.18.1

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Note

Low Risk
Patch-level Yarn version bump in example packages only; no application or CI logic changes.

Overview
Bumps the Corepack packageManager pin from yarn@4.18.0 to yarn@4.18.1 in the two Yarn Modern example projects (examples/yarn-modern and examples/yarn-modern-pnp). No other dependency or script changes.

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