[Snyk] Security upgrade jekyll-last-modified-at from 1.3.0 to 1.3.2

[kkrug]

Snyk has created this PR to fix 2 vulnerabilities in the rubygems dependencies of this project.

Snyk changed the following file(s):

• Gemfile

⚠️ Warning

``` Failed to update the Gemfile.lock, please update manually before merging. ```

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Uncontrolled Resource Consumption ('Resource Exhaustion') SNYK-RUBY-REXML-7577227	738
	Denial of Service (DoS) SNYK-RUBY-REXML-7577228	631

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Uncontrolled Resource Consumption ('Resource Exhaustion')

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