Bump puppeteer from 21.5.2 to 21.6.0 in /app/travel_processor (#865)

Bumps [puppeteer](https://github.com/puppeteer/puppeteer) from 21.5.2 to 21.6.0.
- [Release notes](https://github.com/puppeteer/puppeteer/releases)
- [Changelog](https://github.com/puppeteer/puppeteer/blob/main/release-please-config.json)
- [Commits](puppeteer/puppeteer@puppeteer-v21.5.2...puppeteer-v21.6.0)

---
updated-dependencies:
- dependency-name: puppeteer
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>