Bump json from 2.6.3 to 2.7.1

Bumps [json](https://github.com/flori/json) from 2.6.3 to 2.7.1.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.6.3...v2.7.1)

---
updated-dependencies:
- dependency-name: json
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile

@@ -6,7 +6,7 @@ ruby '2.6.10'
 
 gem 'haml', '~> 6.2'
 gem 'iso-639', '~> 0.3.6'
-gem 'json', '~> 2.6'
+gem 'json', '~> 2.7'
 gem 'mail', '~> 2.8'
 gem 'mime-types', '~> 3.5'
 gem 'nokogiri', '~> 1.13'

Gemfile.lock

@@ -24,7 +24,7 @@ GEM
     http-cookie (1.0.5)
       domain_name (~> 0.5)
     iso-639 (0.3.6)
-    json (2.6.3)
+    json (2.7.1)
     kgio (2.11.4)
     mail (2.8.1)
       mini_mime (>= 0.1.1)
@@ -127,7 +127,7 @@ DEPENDENCIES
   byebug
   haml (~> 6.2)
   iso-639 (~> 0.3.6)
-  json (~> 2.6)
+  json (~> 2.7)
   mail (~> 2.8)
   mime-types (~> 3.5)
   nokogiri (~> 1.13)