chore(deps): update dependency rack-test to v2.1.0

Gemfile.lock

@@ -74,7 +74,7 @@ GEM
     rack-protection (3.0.5)
       rack
     rack-ssl-enforcer (0.2.9)
-    rack-test (2.0.2)
+    rack-test (2.1.0)
       rack (>= 1.3)
     rake (13.0.6)
     rb-fsevent (0.11.2)