Automatic emoji file update uppon CLDR release

[damienalexandre]

In the light of what Github Actions can do, we could have it create a new Pull Request everytime there is a new CLDR release.

The process is:

• watch https://github.com/unicode-org/cldr for new tag starting by release-
• run tools/build-released.php to update all the files (need a parameter for the $version variable https://github.com/jolicode/emoji-search/blob/master/tools/build-released.php#L9)
• open a PR with the changes

That would be awesome.

For information we are at version 38.1, CLDR is at 41!