Update jekyll-relative-links to "~> 0.8.0"

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
jekyll-relative-links	"~> 0.7.0" → "~> 0.8.0"

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Release Notes

benbalter/jekyll-relative-links (jekyll-relative-links)

v0.8.0

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Features

• Add a rellinks Liquid filter that rewrites relative links in already-
  markdownified content — usable as {{ content | markdownify | rellinks }},
  so links inside included fragments get converted (#​98)

Bug fixes

• Convert relative links in Jekyll includes that were previously skipped (#​104)
• Handle hex-encoded (%20) spaces in relative link paths (#​106)
• Correctly handle images nested inside Markdown links (#​107)
• Fix an error when a page's YAML front matter has an excerpt: field (#​97)

Performance

• Use an O(1) hash lookup in url_for_path, speeding up link resolution on
  large sites (#​110)

Documentation

• Document that line-wrapped links are not processed, per the CommonMark spec
  (#​105)

Infrastructure

• Modernize CI — Ruby 3.3 & 4.0 against Jekyll 3.x & 4.x — and bump
  rubocop-rspec to ~> 3.0 (#​115)
• Enable Dependabot for GitHub Actions; bump actions/checkout,
  github/codeql-action, and rubocop-factory_bot (#​111, #​112, #​113, #​114)

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