chore(deps): update dependency rack to v2.2.9

Gemfile.lock

@@ -77,7 +77,7 @@ GEM
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
     racc (1.7.3)
-    rack (2.2.8.1)
+    rack (2.2.9)
     rack-protection (3.2.0)
       base64 (>= 0.1.0)
       rack (~> 2.2, >= 2.2.4)