Bump tinymce from 5.6.2 to 5.7.1 (#3405)

Bumps [tinymce](https://github.com/tinymce/tinymce-dist) from 5.6.2 to 5.7.1.
- [Release notes](https://github.com/tinymce/tinymce-dist/releases)
- [Changelog](https://github.com/tinymce/tinymce-dist/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tinymce/tinymce-dist/compare/5.6.2...5.7.1)

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

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

package.json

@@ -26,7 +26,7 @@
     "popper.js": "^1.16.1",
     "serialize-javascript": "^3.1.0",
     "terser": "^4.6.11",
-    "tinymce": "^5.6.2",
+    "tinymce": "^5.7.1",
     "vue": "^2.6.11",
     "webpack": "^4.43.0",
     "webpack-jquery-ui": "^2.0.1",

yarn.lock

@@ -8700,10 +8700,10 @@ timsort@^0.3.0:
   resolved "https://registry.yarnpkg.com/timsort/-/timsort-0.3.0.tgz#405411a8e7e6339fe64db9a234de11dc31e02bd4"
   integrity sha1-QFQRqOfmM5/mTbmiNN4R3DHgK9Q=
 
-tinymce@^5.6.2:
-  version "5.6.2"
-  resolved "https://registry.yarnpkg.com/tinymce/-/tinymce-5.6.2.tgz#4c20c22e328c5d0baab204928dbc2b0ecbed18b4"
-  integrity sha512-z7zvM5seOPiW86/vqf08kStwW5Zs5U9oQfuqh2rTj4jEcT2QzxT0v72i2zw3W6rbTLldkAej6edFZphj5ee5zg==
+tinymce@^5.7.1:
+  version "5.7.1"
+  resolved "https://registry.yarnpkg.com/tinymce/-/tinymce-5.7.1.tgz#658a6fb4c7d53a8496cc00f8da33f4b8290da06d"
+  integrity sha512-1gY8RClc734srSlkYwY0MQzmkS1j73PuPC+nYtNtrrQVPY9VNcZ4bOiRwzTbdjPPD8GOtv6BAk8Ww/H2RiqKpA==
 
 tmp@^0.0.33:
   version "0.0.33"