Replacing dotenv-rails by dotenv

From dotenv V3 changelog:
> The dotenv-rails gem is now superfluous. It's not technically
  deprecated yet and will continue to work, but the dotenv gem does the
  same thing. bkeepers/dotenv#468

Gemfile

@@ -5,7 +5,7 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}.git" }
 
 ruby File.read('.ruby-version').chomp
 
-gem 'dotenv-rails', require: 'dotenv/rails-now' # Load ENV vars before other gems
+gem 'dotenv', require: 'dotenv/load' # Load ENV vars before other gems
 
 gem 'rails'
 

Gemfile.lock

@@ -259,9 +259,6 @@ GEM
     digest (3.1.1)
     docile (1.4.0)
     dotenv (3.0.0)
-    dotenv-rails (3.0.0)
-      dotenv (= 3.0.0)
-      railties (>= 6.1)
     email_validator (2.2.4)
       activemodel
     erubi (1.12.0)
@@ -846,7 +843,7 @@ DEPENDENCIES
   devise-token_authenticatable
   dfc_provider!
   digest
-  dotenv-rails
+  dotenv
   factory_bot_rails (= 6.2.0)
   faraday
   ffaker