[Snyk] Security upgrade github-pages from 227 to 228

[maban]

Snyk has created this PR to fix 1 vulnerabilities in the rubygems dependencies of this project.

Snyk changed the following file(s):

• Gemfile
• Gemfile.lock

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Improper Restriction of XML External Entity Reference ('XXE') SNYK-RUBY-REXML-7814166	696

---

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