Datacube v1.8.9

Most notable changes:

1. patch_url argument to dc.load() and dc.load_data() (introduced in v1.8.8) is now also supported for Dask loading.
2. Fixed a day-zero bug affecting search over range-type search fields where the target and search field value is of zero-width.
3. Performance improvements to CRS geometry class.
4. Numerous improvements to documentation and github actions.

Full list of changes:

• Performance improvements to CRS geometry class (#1322)
• Extend patch_url argument to dc.load() and dc.load_data() to Dask loading. (#1323)
• Add sphinx.ext.autoselectionlabel extension to readthedoc conf to support :ref: command (#1325)
• Add pyspellcheck for .rst documentation files and fix typos (#1327)
• Add rst documentation lint github action and apply best practices (#1328)
• Follow PEP561_ to make type hints available to other packages (#1331)
• Updated GitHub actions config to remove deprecated set-output (#1333)
• Add what's new page link to menu and general doc fixes (#1335)
• Add search_fields to required for metadata type schema and update doc (#1339)
• Fix typo and update metadata documentation (#1340)
• Add readthedoc preview github action (#1344)
• Update nodata in readthedoc for products page (#1347)
• Add eo-datasets to extensions & related software doc page (#1349)
• Fix bug affecting searches against range types of zero width (#1352)
• Add 1.8.9 release date and missing PR to whats_news.rst (#1353)

Includes contributions from @SpacemanPaul, @omad, @pindge, @snowman2.

With thanks and appreciation to all contributors, users and supporting organisations, expecially Geoscience Australia.