Updated cache busting for tinymce library import

Changes from a manual cache buster string to a app-version-based cache
buster, as per our other scripts and styles.

To address #3611

resources/views/pages/parts/wysiwyg-editor.blade.php

@@ -1,5 +1,5 @@
 @push('head')
-    <script src="{{ url('/libs/tinymce/tinymce.min.js?ver=5.10.2') }}" nonce="{{ $cspNonce }}"></script>
+    <script src="{{ versioned_asset('libs/tinymce/tinymce.min.js') }}" nonce="{{ $cspNonce }}"></script>
 @endpush
 
 <div component="wysiwyg-editor"