fix: Update json gem which has bug

Author: Daniela Lemow

Gemfile.lock

@@ -21,7 +21,7 @@ GEM
     http-accept (1.7.0)
     http-cookie (1.0.5)
       domain_name (~> 0.5)
-    json (2.6.2)
+    json (2.7.2)
     method_source (1.0.0)
     mime-types (3.4.1)
       mime-types-data (~> 3.2015)
@@ -92,4 +92,4 @@ DEPENDENCIES
   rubocop (~> 1.21)
 
 BUNDLED WITH
-   2.3.7
+   2.5.11