fix json gem to 2.12.x until allow_duplicate_key is added to parsing options

Author: jessereynolds

openbolt.gemspec

@@ -49,6 +49,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "concurrent-ruby", "~> 1.0"
   spec.add_dependency "ffi", ">= 1.9.25", "< 2.0.0"
   spec.add_dependency "hiera-eyaml", "~> 3"
+  spec.add_dependency "json", "~> 2.12.0"
   spec.add_dependency "jwt", "~> 2.2"
   spec.add_dependency "logging", "~> 2.2"
   spec.add_dependency "minitar", "~> 0.6"