Bump tar from 7.5.1 to 7.5.6 in /website-astro

Bumps [tar](https://github.com/isaacs/node-tar) from 7.5.1 to 7.5.6.
- [Release notes](https://github.com/isaacs/node-tar/releases)
- [Changelog](https://github.com/isaacs/node-tar/blob/main/CHANGELOG.md)
- [Commits](isaacs/node-tar@v7.5.1...v7.5.6)

---
updated-dependencies:
- dependency-name: tar
  dependency-version: 7.5.6
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]