Update dependency tinymce to v6.7.3

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tinymce (source)	`6.7.2` -> `6.7.3`

Release Notes

tinymce/tinymce (tinymce)

### [`v6.7.3`](https://togithub.com/tinymce/tinymce/blob/HEAD/modules/tinymce/CHANGELOG.md#673---2023-11-15) [Compare Source](https://togithub.com/tinymce/tinymce/compare/6.7.2...6.7.3) ##### Changed - Zero width no-break space (U+FEFF) characters are removed from content passed to `setContent`, `insertContent`, and `resetContent` APIs. #TINY-10305 - Zero width no-break space (U+FEFF) characters in initial content are not loaded into the editor upon initialization. #TINY-10305 ##### Fixed - Specific HTML content containing unescaped text nodes caused mXSS when using undo/redo. #TINY-10305 - Specific HTML content containing unescaped text nodes caused mXSS when using the `getContent` and `setContent` APIs with the `format: 'raw'` option, which also affected the `resetContent` API and the draft restoration feature of the Autosave plugin. #TINY-10305

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getsieutoc / ninjutsu

Update dependency tinymce to v6.7.3 #281

Release Notes

Configuration