v5.21.0

What's new

• Starter kit modules and other misc improvements #10559 by @jesseleite
• Pass any appended form config to antlers #10616 by @ryanmitchell
• Collection Actions #10471 by @edalzell
• Implement NavCreating / NavSaving / NavCreated events #10604 by @duncanmcclean

What's fixed

• Fix rounded corners in asset fields #10624 by @daun
• Fix asset tile buttons in read-only mode #10622 by @daun
• Adjust dark mode readonly label #10623 by @daun
• Add padding to session expiry modal #10620 by @jasonvarga
• Prevent published toast when save failed #10263 by @simonerd
• Change character_limit to integer on textarea #10608 by @jasonvarga
• Adjust behavior of array fields #10467 by @duncanmcclean
• Allow options without labels in the select etc fieldtypes #10336 by @duncanmcclean
• Handle lock timeout in cache middleware #10607 by @jasonvarga
• Render attributes inside single quotes when value contains double quotes #10600 by @ryanmitchell
• Warn when using legacy broadcasting env variable when installing the Collaboration addon #10597 by @duncanmcclean
• Optimize hover titles of asset edit buttons #10603 by @daun
• Update tiptap-php #10611 by @arcs-
• French translations #10609 by @ebeauchamps