Update regex to allow longer and multi-part TLDs (#453)

## Status

- Closes _add issue numbers or delete_
- Related to _add issue numbers or delete_

## Points for consideration:

- Security
- Performance

## What's changed?

_Description of what's been done - bullets are often best_

## Steps to perform after deploying to production

_If the production environment requires any extra work after this PR has
been deployed detail it here. This could be running a Rake task, a
migration, or upgrading a Gem. That kind of thing._

Author: loiswells97

app/models/school.rb

@@ -6,7 +6,7 @@ class School < ApplicationRecord
   has_many :projects, dependent: :nullify
   has_many :roles, dependent: :nullify
 
-  VALID_URL_REGEX = %r{\A(?:https?://)?(?:www.)?[a-z0-9]+([-.]{1}[a-z0-9]+)*\.[a-z]{2,6}(/.*)?\z}ix
+  VALID_URL_REGEX = %r{\A(?:https?://)?(?:www.)?[a-z0-9]+([-.]{1}[a-z0-9]+)*\.[a-z]{2,63}(\.[a-z]{2,63})*(/.*)?\z}ix
 
   validates :name, presence: true
   validates :website, presence: true, format: { with: VALID_URL_REGEX, message: I18n.t('validations.school.website') }

spec/models/school_spec.rb

@@ -123,6 +123,11 @@
       expect(school).to be_invalid
     end
 
+    it 'accepts a url with a multi-part TLD' do
+      school.website = 'https://example.co.uk'
+      expect(school).to be_valid
+    end
+
     it 'does not require a reference' do
       create(:school, id: SecureRandom.uuid, reference: nil)