Merge pull request #170 from ruby/dependabot/bundler/rack-2.2.8.1

Bump rack from 2.2.6.4 to 2.2.8.1

Author: hsbt

Gemfile.lock

@@ -139,7 +139,7 @@ GEM
     puma (6.4.2)
       nio4r (~> 2.0)
     racc (1.7.3)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rack-livereload (0.3.17)
       rack
     rack-test (2.0.2)