[Snyk] Security upgrade middleman from 4.4.0 to 4.6.0

[MManke188]

Snyk has created this PR to fix 1 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
	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-REXML-13110060	631

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[Copilot]

Pull Request Overview

This PR upgrades the middleman gem from version 4.4.0 to 4.6.0 to fix a security vulnerability (Regular Expression Denial of Service - ReDoS) with a score of 631.

• Updates middleman gem version constraint from ~> 4.4, >= 4.4.2 to ~> 4.6, >= 4.6.0

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