Bump react-redux-loading-bar from 4.0.8 to 5.0.4 (#18562)

app/javascript/styles/mastodon/components.scss

@@ -1783,10 +1783,14 @@ a.account__display-name {
     object-fit: contain;
   }
 
-  .loading-bar {
+  .loading-bar__container {
     position: relative;
   }
 
+  .loading-bar {
+    position: absolute;
+  }
+
   &.image-loader--amorphous .image-loader__preview-canvas {
     display: none;
   }