Update json requirement from ~> 1.8, >= 1.8.3 to >= 1.8.3, < 3.0

Updates the requirements on [json](https://github.com/flori/json) to permit the latest version.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v1.8.6...v2.6.1)

---
updated-dependencies:
- dependency-name: json
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     docusign_esign (2.0.0)
-      json (~> 1.8, >= 1.8.3)
+      json (>= 1.8.3, < 3.0)
       jwt (~> 1.0, >= 1.5.2)
       typhoeus (~> 1.0, >= 1.0.1)
 
@@ -25,7 +25,7 @@ GEM
       ffi (>= 1.3.0)
     ffi (1.11.1)
     hashdiff (0.4.0)
-    json (1.8.6)
+    json (2.6.1)
     jwt (1.5.6)
     public_suffix (3.1.0)
     rake (12.0.0)
@@ -45,7 +45,7 @@ GEM
     safe_yaml (1.0.5)
     sys-uname (1.0.4)
       ffi (>= 1.0.0)
-    typhoeus (1.3.1)
+    typhoeus (1.4.0)
       ethon (>= 0.9.0)
     vcr (3.0.3)
     webmock (1.24.6)

docusign_esign.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency 'jwt', '~> 1.0', '>= 1.5.2'
   s.add_runtime_dependency 'typhoeus', '~> 1.0', '>= 1.0.1'
-  s.add_runtime_dependency 'json', '~> 1.8', '>= 1.8.3'
+  s.add_runtime_dependency 'json', '>= 1.8.3', '< 3.0'
 
   s.add_development_dependency 'rspec-mocks', '~> 3.8', '>= 3.8.0'
   s.add_development_dependency 'rspec-expectations', '~> 3.8', '>= 3.8.0'