Prepare Objecttypes API release 3.3.0

[stevenbal]

• Resolve release blockers
  • ⬆️ Upgrade dependencies objecttypes-api#206
  • ♻️ [maykinmedia/open-api-framework#175] Add handled_exception objecttypes-api#209
• Upgrade open-api-framework to latest version
• Check security tab and upgrade packages to fix vulnerabilities
• Check if dark mode works properly for the admin
• Check translations
• Bump API version number (if applicable)
  • Version bump
  • Regenerate API spec
  • Update READMEs with release dates + links
• Bump version number with bin/bump-my-version.sh bump <major|minor|patch>
• Update changelog