fix cargo.lock and gemspec inconsistencies (#136)

Author: martinemde

.rubocop.yml

@@ -12,7 +12,7 @@ AllCops:
   NewCops: enable
   Exclude:
     - vendor/bundle/**/**
-  TargetRubyVersion: 2.6
+  TargetRubyVersion: 3.2
 
 Metrics/ParameterLists:
   Enabled: false
@@ -120,4 +120,4 @@ Style/HashSyntax:
 
 Gemspec/DevelopmentDependencies:
   Enabled: true
-  EnforcedStyle: gemspec
+  EnforcedStyle: gemspec