V4.0.0

1. [Enhancement] Introduced the allow-prereleases input option to allow users to install prerelease versions of Typst.
   • By default, prereleases are not installed.
2. [Breaking Change] Renamed typst-token to token to align with GitHub's official actions.
   • This may affect users using GitHub Enterprise Server (GHES).
3. [Documentation] Updated README.md files in both English and Simplified Chinese.
4. [Dependencies] Updated @actions/cache and other build dependencies.