Bump jekyll-seo-tag from 2.7.1 to 2.8.0

Bumps [jekyll-seo-tag](https://github.com/jekyll/jekyll-seo-tag) from 2.7.1 to 2.8.0.
- [Release notes](https://github.com/jekyll/jekyll-seo-tag/releases)
- [Changelog](https://github.com/jekyll/jekyll-seo-tag/blob/master/History.markdown)
- [Commits](https://github.com/jekyll/jekyll-seo-tag/compare/v2.7.1...v2.8.0)

---
updated-dependencies:
- dependency-name: jekyll-seo-tag
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -65,7 +65,7 @@ GEM
       typhoeus (~> 1.3)
       yell (~> 2.0)
     http_parser.rb (0.8.0)
-    i18n (1.8.11)
+    i18n (1.9.1)
       concurrent-ruby (~> 1.0)
     jekyll (4.2.1)
       addressable (~> 2.4)
@@ -117,7 +117,7 @@ GEM
       rubyzip (>= 1.3.0, < 3.0)
     jekyll-sass-converter (2.1.0)
       sassc (> 2.0.1, < 3.0)
-    jekyll-seo-tag (2.7.1)
+    jekyll-seo-tag (2.8.0)
       jekyll (>= 3.8, < 5.0)
     jekyll-sitemap (1.4.0)
       jekyll (>= 3.7, < 5.0)