Exchange dotenv-rails for dotenv

The -rails gem is no longer needed
bkeepers/dotenv#468

Gemfile

@@ -61,7 +61,7 @@ group :development, :test do
   gem "brakeman", require: false # A static analysis security vulnerability scanner for Ruby on Rails applications [https://github.com/presidentbeef/brakeman]
   gem "bundle-audit", require: false # Patch level verification for Bundler [https://github.com/rubysec/bundler-audit]
   gem "debug", platforms: %i[mri windows] # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
-  gem "dotenv-rails" # A Ruby gem to load environment variables from `.env` [https://github.com/bkeepers/dotenv]
+  gem "dotenv" # A Ruby gem to load environment variables from `.env` [https://github.com/bkeepers/dotenv]
   gem "factory_bot_rails" # A library for setting up Ruby objects as test data [https://github.com/thoughtbot/factory_bot_rails]
   gem "faker", require: false # A library for generating fake data [https://github.com/faker-ruby/faker]
   gem "mail_interceptor" # Intercepts and forwards emails in non-production environments [https://github.com/bigbinary/mail_interceptor]

Gemfile.lock

@@ -126,9 +126,6 @@ GEM
     device_detector (1.1.2)
     diff-lcs (1.5.1)
     dotenv (3.1.0)
-    dotenv-rails (3.1.0)
-      dotenv (= 3.1.0)
-      railties (>= 6.1)
     drb (2.2.1)
     dry-cli (1.0.0)
     dry-configurable (1.1.0)
@@ -464,7 +461,7 @@ DEPENDENCIES
   capybara
   debug
   device_detector
-  dotenv-rails
+  dotenv
   erb_lint
   factory_bot_rails
   faker