[Snyk] Security upgrade hexo from 5.4.0 to 6.0.0

Created by: snyk-bot

Snyk has created this PR to fix one or more vulnerable packages in the `yarn` dependencies of this project.

✨ Snyk has automatically assigned this pull request, set who gets assigned.

As this is a private repository, Snyk-bot does not have access. Therefore, this PR has been created automatically, but appears to have been created by a real user.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • yarn.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	464/1000 Why? Has a fix available, CVSS 5	Cross-site Scripting (XSS) SNYK-JS-HEXO-1932976	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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