improve toast stack RTL styles

docs/resources/changelog.md

@@ -9,6 +9,7 @@ _During the beta period, these restrictions may be relaxed in the event of a mis
 ## Next
 
 - Improved RTL styles for `<sl-button-group>` [#783](https://github.com/shoelace-style/shoelace/issues/783)
+- Improved RTL styles for the toast stack
 
 ## 2.0.0-beta.75
 

src/themes/_utility.css

@@ -11,7 +11,7 @@
 .sl-toast-stack {
   position: fixed;
   top: 0;
-  right: 0;
+  inset-inline-end: 0;
   z-index: var(--sl-z-index-toast);
   width: 28rem;
   max-width: 100%;