Bump nokogiri from 1.13.3 to 1.13.4 (#8)

Author: dependabot[bot]

Gemfile.lock

@@ -226,7 +226,7 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.15.0)
     multipart-post (2.1.1)
-    nokogiri (1.13.3)
+    nokogiri (1.13.4)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     octokit (4.21.0)