[Snyk] Security upgrade jekyll from 4.3.4 to 4.4.0

[mzia]

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 Recursive Entity References in DTDs ('XML Entity Expansion') SNYK-RUBY-REXML-12878608	631

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