Updated release notes following backport of a407b84. Refs #23365.
Skip another test if sqlparse is not available

Refs #23426
Fixed #23627 -- Allowed register_lookup to work as a decorator.
Add shell of hstore.

Doesn't work.
Tidy up to match array's file layout.
Get a very simple hstore working.
Don't add d.c.postgres to installed apps.
Add lookups and transforms for HStoreField.
Add keys and values transforms.
Add validation and serialization.
Add a test for chaining into a field.
Added SimpleHStoreField for forms.
Add KeysValidator for hstore.
Add documentation for HStoreField.
A variety of tweaks to HStore from review.
One more p-Python.
Fix bad docs.
Add mention of d.c.postgres to release notes.
Add docs for the postgres-specific migration operations.
More little tweaks.