chore: upgrade postcss to 8.5.19

[msranjana]

Pull Request Checklist

• I have read the CONTRIBUTING guide.
• I have updated the documentation (not applicable).
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have added tests that prove my fix is effective or that my feature works (not applicable for a dependency update).
• New and existing unit tests pass locally with my changes, where applicable.

Description

This PR upgrades postcss to ^8.5.19 in the relevant packages and refreshes the corresponding lockfiles (package-lock.json and pnpm-lock.yaml).

I verified that the updated dependency is installed (postcss@8.5.19) and confirmed the affected site builds successfully after the upgrade.

Fixes #429

Type of Change

• Bug fix (dependency maintenance/update)
• New feature
• Breaking change
• This change requires a documentation update

[CLAassistant]

All committers have signed the CLA.

[cubic-dev-ai]

No issues found across 15 files

_{Re-trigger cubic}

[Copilot]

Pull request overview

This PR performs a dependency maintenance update across several JavaScript packages in the repo by upgrading postcss to ^8.5.19 and regenerating the associated npm/pnpm lockfiles where that override is applied.

Changes:

• Bump postcss override to ^8.5.19 in the root and multiple subpackages/apps.
• Refresh pnpm lockfiles for vitepress-plugin-moss, moss-md-indexer, and livekit-moss-vercel/agent-react to reflect postcss@8.5.19 (and related transitive updates like nanoid).
• Refresh npm package-lock.json files for the root, moss-md-indexer, apps/next-js, and apps/moss-llamaindex/frontend.

Reviewed changes

Copilot reviewed 7 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/vitepress-plugin-moss/pnpm-lock.yaml	Updates lockfile to resolve postcss@8.5.19 under pnpm for the VitePress plugin package.
packages/vitepress-plugin-moss/package.json	Bumps pnpm overrides to postcss@^8.5.19.
packages/moss-md-indexer/pnpm-lock.yaml	Updates pnpm lockfile to postcss@8.5.19 (and updated transitive deps).
packages/moss-md-indexer/package.json	Bumps overrides and pnpm overrides to postcss@^8.5.19.
packages/moss-md-indexer/package-lock.json	Updates npm lockfile to resolve postcss@8.5.19 for this package.
packages/moss-md-indexer/example/pnpm-lock.yaml	Updates example pnpm lockfile to postcss@8.5.19.
packages/moss-md-indexer/example/package.json	Bumps pnpm overrides to postcss@^8.5.19.
package.json	Bumps root npm overrides to postcss@^8.5.19.
package-lock.json	Updates root npm lockfile to resolve postcss@8.5.19.
apps/next-js/package.json	Bumps overrides to postcss@^8.5.19.
apps/next-js/package-lock.json	Updates npm lockfile to resolve postcss@8.5.19.
apps/moss-llamaindex/frontend/package.json	Bumps overrides to postcss@^8.5.19.
apps/moss-llamaindex/frontend/package-lock.json	Updates npm lockfile to resolve postcss@8.5.19.
apps/livekit-moss-vercel/agent-react/pnpm-lock.yaml	Updates pnpm lockfile to resolve postcss@8.5.19.
apps/livekit-moss-vercel/agent-react/package.json	Bumps pnpm overrides to postcss@^8.5.19.

Files not reviewed (7)

• apps/livekit-moss-vercel/agent-react/pnpm-lock.yaml: Generated file
• apps/moss-llamaindex/frontend/package-lock.json: Generated file
• apps/next-js/package-lock.json: Generated file
• packages/moss-md-indexer/example/pnpm-lock.yaml: Generated file
• packages/moss-md-indexer/package-lock.json: Generated file
• packages/moss-md-indexer/pnpm-lock.yaml: Generated file
• packages/vitepress-plugin-moss/pnpm-lock.yaml: Generated file

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[HarshaNalluru]

thanks for the contribution @msranjana, please address the copilot comment.

[msranjana]

Thanks for the review! I'll address the Copilot comments, make the necessary updates, and let you know once they are done.

[Copilot]

Pull request overview

Copilot reviewed 17 out of 36 changed files in this pull request and generated 2 comments.

Files not reviewed (18)

• apps/livekit-moss-vercel/agent-react/pnpm-lock.yaml: Generated file
• apps/moss-llamaindex/frontend/package-lock.json: Generated file
• apps/moss-vscode/promo/package-lock.json: Generated file
• apps/next-js/package-lock.json: Generated file
• examples/javascript-web/package-lock.json: Generated file
• examples/moss-pikachu/promo/package-lock.json: Generated file
• examples/voice-agents/insurance-adjuster/ui/package-lock.json: Generated file
• moss-live-labs/examples/image-search/react-app/package-lock.json: Generated file
• packages/mastra-moss/package-lock.json: Generated file
• packages/moss-md-indexer/example/pnpm-lock.yaml: Generated file
• packages/moss-md-indexer/package-lock.json: Generated file
• packages/moss-md-indexer/pnpm-lock.yaml: Generated file
• packages/vercel-sdk/package-lock.json: Generated file
• packages/vitepress-plugin-moss/demo-site/documentation/package-lock.json: Generated file
• packages/vitepress-plugin-moss/demo-site/documentation/pnpm-lock.yaml: Generated file
• packages/vitepress-plugin-moss/demo-site/pnpm-lock.yaml: Generated file
• packages/vitepress-plugin-moss/pnpm-lock.yaml: Generated file
• sdks/javascript/sdk/package-lock.json: Generated file