Merge pull request #4 from libtcod/dependabot/bundler/nokogiri-1.13.4

Bump nokogiri from 1.13.3 to 1.13.4

Author: HexDecimal

Gemfile.lock

@@ -230,9 +230,9 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.14.4)
     multipart-post (2.1.1)
-    nokogiri (1.13.3-x64-mingw32)
+    nokogiri (1.13.4-x64-mingw32)
       racc (~> 1.4)
-    nokogiri (1.13.3-x86_64-linux)
+    nokogiri (1.13.4-x86_64-linux)
       racc (~> 1.4)
     octokit (4.21.0)
       faraday (>= 0.9)