New features:
- Remove deprecated ``plone.app.widgets``
[petschki] 3686
- Add `plone-61` as zcml feature, and define `PLONE61MARKER` as True.
[maurits] 6100
Bug fixes:
- Explicitly disable ``Products.CMFCore.explicitacquisition`` in Plone 6.
[jaroel] explicitacquisition
- Register site syndication settings from plone.base instead of CMFPlone.
[maurits] 315
- Remove the plone.app.multilingual dependency
[folix-01] 3779
- Do not use `UniqueObject` class for `PlonePortal`
[petschki] 3823
- Fix deprecated imports.
[petschki] 3830
- avoid searching all users after group editing, when many_users is flagged mamico 3845
- Updated metadata version to 6019.
[maurits] 6019
- Updated metadata version to 6100.
[maurits] 6100
Internal:
- cleanup: remove `mock` from test dependencies. jairhenrique 3857