Update cross-spawn requirement from ^4.0.0 to ^6.0.5
Update cross-spawn requirement from ^4.0.0 to ^6.0.5

Updates the requirements on [cross-spawn](https://github.com/moxystudio/node-cross-spawn) to permit the latest version.
- [Release notes](https://github.com/moxystudio/node-cross-spawn/releases)
- [Changelog](https://github.com/moxystudio/node-cross-spawn/blob/master/CHANGELOG.md)
- [Commits](https://github.com/moxystudio/node-cross-spawn/commits/v6.0.5)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
hexojs/hexo-util,hexojs/hexo-util