⚗️ Explicitely require active_record

Because of the following deprecation message:
> DEPRECATION WARNING: ActiveSupport::ProxyObject is deprecated and will
> be removed in Rails 8.0.
> Use Ruby's built-in BasicObject instead.

I've found that it comes from this gem:
```sh
❯ ruby -rbundler/setup -e "Bundler.require"
.asdf/installs/ruby/3.3.5/lib/ruby/gems/3.3.0/gems/embedded_localization-1.3.0/lib/embedded_localization.rb:9:in `<top (required)>': uninitialized constant ActiveRecord (NameError)

ActiveRecord::Base.extend(EmbeddedLocalization::ActiveRecord::ActMacro)
```

Author: RomainMorlevat

lib/embedded_localization.rb

@@ -1,3 +1,4 @@
+require "active_record"
 require "embedded_localization/version"
 require 'extensions/hash'