chore(deps): update dependency json to v2.21.1

Author: renovate[bot]

Gemfile

@@ -26,7 +26,7 @@ gem 'abbrev', '0.1.2'
 
 # Grype run result on 2026-03-26
 # json     2.18.1     2.19.2    gem   GHSA-3m6g-2423-7cp3  High      < 0.1% (3rd)  < 0.1
-gem 'json', '2.20.0'
+gem 'json', '2.21.1'
 
 # Really needed gems
 # ------------------

Gemfile.lock

@@ -172,7 +172,7 @@ GEM
     httpclient (2.9.0)
       mutex_m
     jmespath (1.6.2)
-    json (2.20.0)
+    json (2.21.1)
     jwt (2.10.3)
       base64
     logger (1.7.0)
@@ -238,7 +238,7 @@ PLATFORMS
 DEPENDENCIES
   abbrev (= 0.1.2)
   fastlane (= 2.237.0)
-  json (= 2.20.0)
+  json (= 2.21.1)
 
 BUNDLED WITH
    2.6.9