Bump tinymce from 6.4.2 to 6.5.1

Bumps [tinymce](https://github.com/tinymce/tinymce/tree/HEAD/modules/tinymce) from 6.4.2 to 6.5.1.
- [Changelog](https://github.com/tinymce/tinymce/blob/develop/modules/tinymce/CHANGELOG.md)
- [Commits](https://github.com/tinymce/tinymce/commits/6.5.1/modules/tinymce)

---
updated-dependencies:
- dependency-name: tinymce
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -70,7 +70,7 @@
         "spectrum-colorpicker2": "^2.0.10",
         "spin.js": "^4.1.0",
         "swagger-ui-dist": "^4.19.0",
-        "tinymce": "^6.4.2",
+        "tinymce": "^6.5.1",
         "tinymce-i18n": "^23.6.19"
     },
     "scripts": {