Bump rest-client from 1.6.7 to 1.8.0 in /api/ruby/basics-of-authentication (#301)

* Bump rest-client in /api/ruby/basics-of-authentication

Bumps [rest-client](https://github.com/rest-client/rest-client) from 1.6.7 to 1.8.0.
- [Release notes](https://github.com/rest-client/rest-client/releases)
- [Changelog](https://github.com/rest-client/rest-client/blob/master/history.md)
- [Commits](rest-client/rest-client@v1.6.7...v1.8.0)

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

* Newer Ruby versions have json built-in

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Johannes Nicolai <[email protected]>

Author: dependabot[bot]

api/ruby/basics-of-authentication/Gemfile

@@ -1,5 +1,4 @@
 source "http://rubygems.org"
 
-gem "json",        "~> 1.8"
 gem 'sinatra',     '~> 1.3.5'
-gem 'rest-client', '~> 1.6.3'
+gem 'rest-client', '~> 1.8.0'

api/ruby/basics-of-authentication/Gemfile.lock

@@ -1,26 +1,34 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    json (1.8.3)
-    mime-types (1.21)
+    domain_name (0.5.20190701)
+      unf (>= 0.0.5, < 1.0.0)
+    http-cookie (1.0.3)
+      domain_name (~> 0.5)
+    mime-types (2.99.3)
+    netrc (0.11.0)
     rack (1.5.2)
     rack-protection (1.3.2)
       rack
-    rest-client (1.6.7)
-      mime-types (>= 1.16)
+    rest-client (1.8.0)
+      http-cookie (>= 1.0.2, < 2.0)
+      mime-types (>= 1.16, < 3.0)
+      netrc (~> 0.7)
     sinatra (1.3.5)
       rack (~> 1.4)
       rack-protection (~> 1.3)
       tilt (~> 1.3, >= 1.3.3)
     tilt (1.3.3)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.7.6)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  json (~> 1.8)
-  rest-client (~> 1.6.3)
+  rest-client (~> 1.8.0)
   sinatra (~> 1.3.5)
 
 BUNDLED WITH
-   1.10.6
+   1.17.2