Merge pull request #524 from nervosnetwork/dependabot/bundler/rack-2.0.8

chore(deps): bump rack from 2.0.7 to 2.0.8

Author: shaojunda

Gemfile.lock

@@ -235,7 +235,7 @@ GEM
     puma (4.3.1)
       nio4r (~> 2.0)
     raabro (1.1.6)
-    rack (2.0.7)
+    rack (2.0.8)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-attack (6.2.1)