chore(deps): update dependency rack-test to v2.2.0

Author: renovate[bot]

Gemfile.lock

@@ -81,7 +81,7 @@ GEM
       base64 (>= 0.1.0)
       rack (~> 2.2, >= 2.2.4)
     rack-ssl-enforcer (0.2.9)
-    rack-test (2.1.0)
+    rack-test (2.2.0)
       rack (>= 1.3)
     rake (13.2.1)
     rb-fsevent (0.11.2)