Bump tinymce from 6.7.1 to 6.7.3 in /src/Umbraco.Web.UI.Client

Bumps [tinymce](https://github.com/tinymce/tinymce/tree/HEAD/modules/tinymce) from 6.7.1 to 6.7.3.
- [Changelog](https://github.com/tinymce/tinymce/blob/develop/modules/tinymce/CHANGELOG.md)
- [Commits](https://github.com/tinymce/tinymce/commits/6.7.3/modules/tinymce)

---
updated-dependencies:
- dependency-name: tinymce
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Umbraco.Web.UI.Client/package-lock.json

@@ -39,7 +39,7 @@
         "ng-file-upload": "12.2.13",
         "nouislider": "15.7.1",
         "spectrum-colorpicker2": "2.0.10",
-        "tinymce": "6.5.1",
+        "tinymce": "6.7.3",
         "typeahead.js": "0.11.1",
         "underscore": "1.13.6",
         "wicg-inert": "3.1.2"
@@ -16326,9 +16326,9 @@
       "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q=="
     },
     "node_modules/tinymce": {
-      "version": "6.5.1",
-      "resolved": "https://registry.npmjs.org/tinymce/-/tinymce-6.5.1.tgz",
-      "integrity": "sha512-J67fxJiX3tjvVqer1dg1+cOxMeE2P55ESGhaakvqGPbAUU45HnCMLSioaOsxV1KfcXustw9WJo0rtn1SNQlVKQ=="
+      "version": "6.7.3",
+      "resolved": "https://registry.npmjs.org/tinymce/-/tinymce-6.7.3.tgz",
+      "integrity": "sha512-J7WmYIi/gt1RvZ6Ap2oQiUjzAoiS9pfV+d4GnKuZuPu8agmlAEAInNmMvMjfCNBzHv4JnZXY7qlHUAI0IuYQVA=="
     },
     "node_modules/to-absolute-glob": {
       "version": "2.0.2",

src/Umbraco.Web.UI.Client/package.json

@@ -51,7 +51,7 @@
     "ng-file-upload": "12.2.13",
     "nouislider": "15.7.1",
     "spectrum-colorpicker2": "2.0.10",
-    "tinymce": "6.5.1",
+    "tinymce": "6.7.3",
     "typeahead.js": "0.11.1",
     "underscore": "1.13.6",
     "wicg-inert": "3.1.2"