chore: add js-yaml version override to fix dependabot

[VasilyStrelyaev]

No description provided.

[Copilot]

Pull request overview

This PR upgrades Lerna from v5.6.2 to v9.0.3 to address Dependabot issues. The changes modernize the monorepo configuration to align with Lerna v9's best practices.

Key changes:

• Upgrades Lerna from v5.6.2 to v9.0.3 (major version bump)
• Removes the deprecated postinstall: lerna bootstrap script and adds native npm workspaces configuration
• Deletes the package-lock.json file from the devextreme-schematics package (likely to be regenerated)

Reviewed changes

Copilot reviewed 2 out of 5 changed files in this pull request and generated no comments.

File	Description
package.json	Bumps lerna to v9.0.3, removes deprecated postinstall script, adds workspaces configuration
lerna.json	Adds $schema reference for IDE support and validation
packages/devextreme-schematics/package-lock.json	Removes package-lock.json (will be regenerated with updated dependencies)

Files not reviewed (1)

• packages/devextreme-schematics/package-lock.json: Language not supported

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.