Improve CI performance by caching Playwright dependencies

[antaranyan]

    Performance can be further improved by caching Playwright dependencies.

Originally posted by @antaranyan in https://github.com/despan/machina/issues/14#issuecomment-1264852191

[antaranyan]

Check:

• https://github.com/microsoft/playwright/issues/7249
• https://playwrightsolutions.com/playwright-github-action-to-cache-the/