Bump capybara from 3.12.0 to 3.15.0

Bumps [capybara](https://github.com/teamcapybara/capybara) from 3.12.0 to 3.15.0.
- [Release notes](https://github.com/teamcapybara/capybara/releases)
- [Changelog](https://github.com/teamcapybara/capybara/blob/master/History.md)
- [Commits](https://github.com/teamcapybara/capybara/compare/3.12.0...3.15.0)

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

Gemfile.lock

@@ -42,19 +42,19 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
+    addressable (2.6.0)
       public_suffix (>= 2.0.2, < 4.0)
     archive-zip (0.11.0)
       io-like (~> 0.3.0)
     arel (9.0.0)
-    better_errors (2.5.0)
+    better_errors (2.5.1)
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
     builder (3.2.3)
-    capybara (3.12.0)
+    capybara (3.15.0)
       addressable
       mini_mime (>= 0.1.3)
       nokogiri (~> 1.8)
@@ -97,7 +97,7 @@ GEM
       activesupport (>= 4.2.0)
     hashdiff (0.3.7)
     hashie (3.5.7)
-    http (4.0.0)
+    http (4.1.1)
       addressable (~> 2.3)
       http-cookie (~> 1.0)
       http-form_data (~> 2.0)
@@ -106,7 +106,7 @@ GEM
       domain_name (~> 0.5)
     http-form_data (2.1.1)
     http_parser.rb (0.6.0)
-    i18n (1.5.1)
+    i18n (1.5.2)
       concurrent-ruby (~> 1.0)
     io-like (0.3.0)
     jwt (1.5.6)
@@ -128,7 +128,7 @@ GEM
     multi_xml (0.6.0)
     multipart-post (2.0.0)
     nio4r (2.3.1)
-    nokogiri (1.10.0)
+    nokogiri (1.10.1)
       mini_portile2 (~> 2.4.0)
     oauth2 (1.4.0)
       faraday (>= 0.8, < 0.13)
@@ -150,7 +150,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (3.12.1)
     rack (2.0.6)
     rack-proxy (0.6.4)
       rack
@@ -194,7 +194,7 @@ GEM
     rspec-mocks (3.8.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
-    rspec-rails (3.8.1)
+    rspec-rails (3.8.2)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       railties (>= 3.0)