[5.x] Fix z-index issue when configuring Replicator fields (#10937)

Co-authored-by: Jason Varga <jason@pixelfear.com>

resources/js/components/fields/Settings.vue

@@ -25,7 +25,7 @@
                 v-text="__('Apply')"
             ></button>
         </header>
-        <section class="py-4 px-3 md:px-8">
+        <section class="isolate py-4 px-3 md:px-8">
             <div class="tabs-container">
                 <div class="publish-tabs tabs">
                     <button class="tab-button"