Update Changeset config to link create-hydrogen to dependencies

[gfscott]

Follow up to #1873 — instead of installing latest, this links the create-hydrogen package to other packages it depends on.

We don't bump create-hydrogen's version that often because it's so simple, so it can get out of sync with other packages, even though it should basically always be installing the latest dependencies.

Linking the packages in Changesets means create-hydrogen will always get bumped when one of its dependencies does, which should lead to the expected behavior.

I'm linking these packages because they're the ones that are included in @next releases and create-hydrogen should always be up to date for testing purposes.

[gfscott]

Closing this because a little more investigation showed it's a build error in the @next publishing workflow that caused package hashes to get out of sync in this case.

This might still be a worthwhile idea but closing the issue because it's unrelated. Carry on