Bump tinymce from 6.8.1 to 6.8.3 (#4249)

Bumps [tinymce](https://github.com/tinymce/tinymce/tree/HEAD/modules/tinymce) from 6.8.1 to 6.8.3.
- [Changelog](https://github.com/tinymce/tinymce/blob/develop/modules/tinymce/CHANGELOG.md)
- [Commits](https://github.com/tinymce/tinymce/commits/6.8.3/modules/tinymce)

---
updated-dependencies:
- dependency-name: tinymce
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -27,7 +27,7 @@
     "select2": "4.0.13",
     "select2-bootstrap-theme": "0.1.0-beta.10",
     "tempusdominus-bootstrap-4": "^5.39.2",
-    "tinymce": "^6.8.1",
+    "tinymce": "^6.8.3",
     "@tinymce/tinymce-jquery": "^2.1.0"
   },
   "scripts": {