chore(deps): update jekyll ecosystem packages to v0.8.0

[renovate]

This PR contains the following updates:

Package	Update	Change
jekyll-avatar	minor	0.7.0 -> 0.8.0
jekyll-feed	minor	0.15.1 -> 0.17.0
jemoji	minor	0.12.0 -> 0.13.0

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Release Notes

jekyll/jekyll-avatar (jekyll-avatar)

v0.8.0

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Minor Enhancements

• Use Kernel#format to render <img /> HTML tag (#​46)
• Check if username and size matches a pattern once (#​48)

Bug Fixes

• Reduce allocations from computing username (#​44)
• Stringify keys of :attributes hash (#​42)
• Parse tag markup once per instance (#​40)
• Compute :srcset with an array of integer strings (#​43)
• Assign string values for attributes (#​47)
• Parse only custom-host provided through ENV (#​45)

Development Fixes

• Profile memory usage from rendering avatars (#​41)
• Bundle only relevant files in the gem (#​50)
• Upgrade to GitHub-native Dependabot (#​52)
• Remove redundant specifications (#​56)
• Improve context in workflow job names (#​57)
• Remove @benbalter-specific community health files (#​58)
• Update gem specification (#​60)
• Add workflow to release gem via GH Actions (#​63)

Documentation

• Fix typo in README.md (#​62)

jekyll/jekyll-feed (jekyll-feed)

v0.17.0

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Documentation

• Update CI status badge (#​363)

Development Fixes

• Add Ruby 3.1 to the CI matrix (#​365)

Minor Enhancements

• Allow disabling of jekyll-feed while in development (#​370)

v0.16.0

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Minor Enhancements

• Add support for page.description in front matter to become entry <summary> (#​297)

Bug Fixes

• Fold private methods into the :render method as local variables (#​327)
• Check post.categories instead of post.category (#​357)
• Switched xml_escape for <![CDATA[]]> for post content (#​332)

Development Fixes

• Add Ruby 3.0 to CI (#​337)
• Lock RuboCop to v1.18.x (#​348)
• Add workflow to release gem via GH Action (#​355)

Documentation

• Use .atom extension in documented examples since we write an Atom feed (#​359)

jekyll/jemoji (jemoji)

v0.13.0

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Development Fixes

• Add Actions CI workflow (#​127)
• Add release workflow (#​128)
• Create dependabot config for rubygems upgrades (#​126)
• Add github-actions to dependabot (#​132)
• Bump actions/checkout from 2 to 3 (#​133)
• Upgrade Rubocop target version to 2.7 (#​134)
• Update rake requirement from ~> 12.0 to ~> 13.0 (#​130)

Minor Enhancements

• Update gemoji requirement from ~> 3.0 to >= 3, < 5 & test with both major versions (#​131)

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