fix: Gemfile & Gemfile.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-NOKOGIRI-7164639

Gemfile

@@ -49,7 +49,7 @@ end
 
 group :test do
   # Adds support for Capybara system testing and selenium driver
-  gem 'capybara', '>= 2.15'
+  gem 'capybara', '>= 3.39.1'
   gem 'selenium-webdriver'
   # Easy installation and use of web drivers to run system tests with browsers
   gem 'webdrivers'

Gemfile.lock

@@ -56,15 +56,15 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
       zeitwerk (~> 2.2, >= 2.2.2)
-    addressable (2.8.4)
+    addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     ast (2.4.2)
     bindex (0.8.1)
     bootsnap (1.16.0)
       msgpack (~> 1.2)
     builder (3.2.4)
     byebug (11.1.3)
-    capybara (3.39.0)
+    capybara (3.39.2)
       addressable
       matrix
       mini_mime (>= 0.1.3)
@@ -111,8 +111,8 @@ GEM
     marcel (1.0.2)
     matrix (0.4.2)
     method_source (1.0.0)
-    mini_mime (1.1.2)
-    mini_portile2 (2.8.1)
+    mini_mime (1.1.5)
+    mini_portile2 (2.8.7)
     minitest (5.18.0)
     msgpack (1.7.0)
     net-imap (0.3.4)
@@ -125,17 +125,17 @@ GEM
     net-smtp (0.3.3)
       net-protocol
     nio4r (2.5.9)
-    nokogiri (1.14.3)
-      mini_portile2 (~> 2.8.0)
+    nokogiri (1.15.6)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     parallel (1.22.1)
     parser (3.2.2.0)
       ast (~> 2.4.1)
-    public_suffix (5.0.1)
+    public_suffix (5.0.5)
     puma (4.3.12)
       nio4r (~> 2.0)
-    racc (1.6.2)
-    rack (2.2.6.4)
+    racc (1.8.0)
+    rack (2.2.9)
     rack-proxy (0.7.6)
       rack
     rack-test (2.1.0)
@@ -171,7 +171,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    regexp_parser (2.7.0)
+    regexp_parser (2.9.2)
     rexml (3.2.5)
     rubocop (0.89.1)
       parallel (~> 1.10)
@@ -254,7 +254,7 @@ PLATFORMS
 DEPENDENCIES
   bootsnap (>= 1.4.2)
   byebug
-  capybara (>= 2.15)
+  capybara (>= 3.39.1)
   graphlient
   jbuilder (~> 2.7)
   listen (>= 3.0.5, < 3.2)