feat(components): prepare post-avatar component for stencil update (#5148)

Co-authored-by: Philipp Gfeller <[email protected]>

Author: oliverschuerch

.changeset/silly-turtles-notice.md

@@ -0,0 +1,5 @@
+---
+'@swisspost/design-system-components': patch
+---
+
+Added the `reflect: true` option to the `post-avatar` component property `firstname` to prepare the component for the next stencil update.

packages/components/src/components/post-avatar/post-avatar.tsx

@@ -32,7 +32,7 @@ export class PostAvatar {
   /**
    * Defines the users firstname.
    */
-  @Prop() readonly firstname!: string;
+  @Prop({ reflect: true }) readonly firstname!: string;
 
   /**
    * Defines the users lastname.