v6.14.0

What's new

• Fieldset sections #14297 by @jackmcdade
• Collaboration support #13974 by @joshuablum

What's fixed

• Use he-tree i18n prop for tree aria instructions #14499 by @jasonvarga
• Rename Add Block back to Add Set in replicators #14503 by @joshuablum
• Resolve Cascade content closure before checking content #14502 by @marcorieser
• Fix nocache database driver failing on MySQL with invalid UTF-8 #14505 by @jasonvarga
• Fix bard undos #14506 by @jackmcdade
• Fix collection listing search case insensitivity #14486 by @joshuablum
• Bump follow-redirects from 1.15.11 to 1.16.0 #14498 by @dependabot
• Bump dompurify from 3.3.3 to 3.4.0 #14500 by @dependabot