Upgrade dependent packages to the latest version

[yhatt]

This PR will upgrade dependent packages to the latest version via yarn upgrade --latest.

Notable changes

• Bumped Marpit to v1.5.1, and Marp Core to v1.1.0.
  • Marp Core v1.1.0 includes the updated style of default theme because of bumped github-markdown-css.
• Rollup has bumped major version v2, and typescript plugin becomes to v4 to support emitting type declarations while build. However, we don't apply a change of setting because it will be restricted rollup and TS configurations.
• According to update log in past versions of chrome-launcher that we had missed due to the lacked release notes, now Launcher.getInstallations() for locating Chrome installations can use as a public interface (feat: expose public interface for locating Chrome installations GoogleChrome/chrome-launcher#177). We are no longer using chrome-launcher/dist/chrome-finder in favor of this public interface.

NOTE: Releasing the next minor release is better to wait for the deprecation of --preview mode due to #211 (comment).