Bump jwt from 1.5.6 to 2.1.0

Bumps [jwt](https://github.com/jwt/ruby-jwt) from 1.5.6 to 2.1.0.
- [Release notes](https://github.com/jwt/ruby-jwt/releases)
- [Changelog](https://github.com/jwt/ruby-jwt/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jwt/ruby-jwt/compare/v1.5.6...v2.1.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -28,7 +28,7 @@ gem 'stripe', '~> 3.3.2'
 gem 'activemerchant', '~> 1.78'
 
 gem 'oauth2', '~> 1.4.1' # Used for Stripe Connect
-gem 'jwt', '~> 1.5'
+gem 'jwt', '~> 2.1'
 
 gem 'delayed_job_active_record'
 gem 'daemons'

Gemfile.lock

@@ -508,7 +508,7 @@ GEM
     json_spec (1.1.5)
       multi_json (~> 1.0)
       rspec (>= 2.0, < 4.0)
-    jwt (1.5.6)
+    jwt (2.1.0)
     kaminari (0.13.0)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
@@ -813,7 +813,7 @@ DEPENDENCIES
   jquery-migrate-rails
   jquery-rails
   json_spec (~> 1.1.4)
-  jwt (~> 1.5)
+  jwt (~> 2.1)
   knapsack
   letter_opener (>= 1.4.1)
   listen (= 3.0.8)