chore(deps): update jekyll ecosystem packages to '~> 2.9.0'

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
jekyll-seo-tag	'~> 2.8.0' → '~> 2.9.0'

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Release Notes

jekyll/jekyll-seo-tag (jekyll-seo-tag)

v2.9.0

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Minor Enhancements

• Added the twitter:description tag (#​464)
• Support for image paths relative to the page's directory (#​466)
• Truncate the description value to 100 words (#​492)
• Add support for title_category (#​517)
• feat: Add canonical=false option to disable canonical URL output (#​521)
• Add a article:modified_time property for articles (#​515)

Bug Fixes

• Use attribute name consistently for metadata under twitter namespace (#​437)

Documentation

• Migrate build badge to GH Actions (#​499)

Development Fixes

• Add Ruby 3.1 to CI matrix (#​459)
• chore: remove git.io (#​462)
• Bump versions in workflows (#​516)
• fix: Fix rubocop offenses (#​518)

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