Add address1 format strings for NL; prepare v1.21.3 patch release

[rochlefebvre]

What are you trying to accomplish?

Define canonical address1 formats for Netherlands addresses having a building number only, or both a building and a unit number. Note that no Worldwide methods leverage these patterns.

I'm also preparing a patch release with these changes.

Checklist

• I have added a CHANGELOG entry for this change (or determined that it isn't needed)

[rochlefebvre]

Using these UPU formatting guidelines as a reference, since the post.nl website does not seem to specify how to write the unit.

Our own logs show that most NL subpremise addresses use a hyphen between the house and unit numbers.

[o-benz]

LGTM!

little note: don't we usually make the fix and cut the new version in two separate PRs 🤔 ?

PS: (I'm bumping worldwide and country_db in these PRs: https://github.com/Shopify/atlas/pull/6803, https://github.com/shop/world/pull/375097, if you'd like, I can hold off until your new versions of worldwide and country are cut and tagged so I can just bump from 1.21.0 to 1.21.3 directly)

[rochlefebvre]

LGTM!

little note: don't we usually make the fix and cut the new version in two separate PRs 🤔 ?

Yes, we usually do separate the code changes from the version bumps. In cases like mine, where we need to release the code change imminently, then we may bundle them together.

PS: (I'm bumping worldwide and country_db in these PRs: Shopify/atlas#6803, shop/world#375097, if you'd like, I can hold off until your new versions of worldwide and country are cut and tagged so I can just bump from 1.21.0 to 1.21.3 directly)

You may go ahead with your PRs and ignore mine. This PR is actually transparent to country_db (no changes or bumping needed for that library). Worst case, I bump worldwide before you do and your PR needs to play catch up.