Bump recaptcha gem to 3.0.0 to remove deprecated stoken support

Closes #18210

CHANGELOG

@@ -8,6 +8,7 @@ v 8.9.0 (unreleased)
   - Make EmailsOnPushWorker use Sidekiq mailers queue
   - Fix wiki page events' webhook to point to the wiki repository
   - Fix issue todo not remove when leave project !4150 (Long Nguyen)
+  - Bump recaptcha gem to 3.0.0 to remove deprecated stoken support
   - Allow forking projects with restricted visibility level
   - Improve note validation to prevent errors when creating invalid note via API
   - Reduce number of fog gem dependencies

Gemfile

@@ -38,7 +38,7 @@ gem 'rack-oauth2',            '~> 1.2.1'
 gem 'jwt'
 # Spam and anti-bot protection
-gem 'recaptcha', require: 'recaptcha/rails'
+gem 'recaptcha', '~> 3.0', require: 'recaptcha/rails'
 gem 'akismet', '~> 2.0'
 # Two-factor authentication

Gemfile.lock

@@ -549,7 +549,7 @@ GEM
       debugger-ruby_core_source (~> 1.3)
     rdoc (3.12.2)
       json (~> 1.4)
-    recaptcha (1.0.2)
+    recaptcha (3.0.0)
       json
     redcarpet (3.3.3)
     redis (3.3.0)
@@ -932,7 +932,7 @@ DEPENDENCIES
   raphael-rails (~> 2.1.2)
   rblineprof
   rdoc (~> 3.6)
-  recaptcha
+  recaptcha (~> 3.0)
   redcarpet (~> 3.3.3)
   redis (~> 3.2)
   redis-namespace