fix: nokogiri gem update due to security

[jmeridth]

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PR Overview

This PR addresses a security update by adding the nokogiri gem while reordering the github-pages gem declaration in the Gemfile.

• Added the nokogiri gem at version "~> 1.18.3"
• Moved the github-pages gem declaration to follow faraday-retry, possibly for clarity or dependency order

Reviewed Changes

File	Description
Gemfile	Added nokogiri gem and adjusted the ordering of gems

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