Bump postcss and parcel in /demo

[dependabot]

Removes postcss. It's no longer used after updating ancestor dependency parcel. These dependencies need to be updated together.

Removes postcss

Updates parcel from 2.0.0-nightly.419 to 2.9.3

Release notes

Sourced from parcel's releases.

v2.9.3

Fixed

• Resolver

  • Fix the development and production package conditions – Details

• JavaScript

  • Update SWC to fix generics in JSX elements – Details

v2.9.2

Fixed

• Core
  • Fix infinite loop when entries look like globs – Details
  • Fix proxyrc require from path – Details
• JavaScript
  • Treat re-exports of * from empty files with sideEffects: false as ESM – Details
• CSS
  • Fix self references error in CSS module JS assets causing "Bundle group cannot have more than one entry bundle of the same type" – Details
• Dev server
  • Serve folder's index when requesting folder without slash – Details
• Web extensions
  • Allow source maps files in webextension – Details
• Image
  • Add core as peerdep to image optimizer – Details

v2.9.1

Fixed

• Resolver
  • Ignore invalid package.json "type" field values – Details
  • Ignore duplicate slashes at the start of relative path specifiers – Details

v2.9.0

Parcel v2.9.0 includes many long requested features, including a brand new resolver with support for package.json "exports" and tsconfig.json features, support for ESM plugins and configs, and local Parcel plugins. It also improves performance with a new default JS minifier powered by SWC, incremental symbol propagation, and improved bundler data structures.

Blog post: https://parceljs.org/blog/v2-9-0/

Added

• Core

  • Add support for ESM plugins and configs – Details
  • Add support for local parcel plugins – Details
  • Incremental Symbol Propagation for improved performance and improved export errors in development – Details
  • Add support for plugin tracing, which shows where time is being spent during a Parcel build – Details
  • Support .proxyrc.cjs config files – Details
  • Add support for loadConfig function to resolver plugins – Details

• Resolver

  • New resolver implementation in Rust supporting package.json "exports" and "imports", and tsconfig.json "baseUrl", "paths", and "moduleSuffixes" – Details

... (truncated)

Changelog

Sourced from parcel's changelog.

[2.9.3] – 2023-06-24

Fixed

• Resolver

  • Fix the development and production package conditions – Details

• JavaScript

  • Update SWC to fix generics in JSX elements – Details

[2.9.2] - 2023-06-08

Fixed

• Core

  • Fix infinite loop when entries look like globs – Details
  • Fix proxyrc require from path – Details

• JavaScript

  • Treat re-exports of * from empty files with sideEffects: false as ESM – Details

• CSS

  • Fix self references error in CSS module JS assets causing "Bundle group cannot have more than one entry bundle of the same type" – Details

• Dev server

  • Serve folder's index when requesting folder without slash – Details

• Web extensions

  • Allow source maps files in webextension – Details

• Image

  • Add core as peerdep to image optimizer – Details

[2.9.1] - 2023-06-07

Fixed

• Resolver
  • Ignore invalid package.json "type" field values – Details
  • Ignore duplicate slashes at the start of relative path specifiers – Details

[2.9.0] - 2023-05-26

Added

• Core
  • Add support for ESM plugins and configs – Details
  • Add support for local parcel plugins – Details
  • Incremental Symbol Propagation for improved performance and improved export errors in development – Details
  • Add support for plugin tracing, which shows where time is being spent during a Parcel build – Details

... (truncated)

Commits

• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
  You can disable automated security fix PRs for this repo from the Security Alerts page.