Fix: check for ownProperties on Richtext renderer HTML attributes

[Edo-San]

Pull request type

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Other (please describe):

How to test this PR

• Add a property to tag.attrs prototype
• Render a Richtext field
• Check that the added property is NOT looped over

What is the new behavior?

This PR fixes a potential security issue related to looping over object properties without assessing if they are object own properties or part of the prototype chain.

[notion-workspace[bot]]

Avoid looping over other prototype chain properties in richtextResolver

[github-actions[bot]]

:tada: This PR is included in version 6.8.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: