fix(post-icon): add package version in CDN fallback URL for v8 (#5090)

## 📄 Description

Updated the fallback CDN URL in the `post-icon` component for release/v8
branch.

---

## 📝 Checklist

- ✅ My code follows the style guidelines of this project
- 🛠️ I have performed a self-review of my own code
- 📄 I have made corresponding changes to the documentation
- ⚠️ My changes generate no new warnings or errors
- 🧪 I have added tests that prove my fix is effective or that my feature
works
- ✔️ New and existing unit tests pass locally with my changes

---------

Co-authored-by: Oliver Schürch <oliver.schuerch@post.ch>

Author: alionazherdetska

.changeset/strange-seas-drop.md

@@ -0,0 +1,6 @@
+---
+'@swisspost/design-system-components': patch
+---
+
+Updated the fallback CDN URL in the `post-icon` component to include the current package version, ensuring icon requests match the used component version.
+

packages/components/cypress.config.js

@@ -1,5 +1,5 @@
 const { defineConfig } = require('cypress');
-
+const { version } = require('./package.json');
 module.exports = defineConfig({
   e2e: {
     baseUrl: 'http://localhost:9001',
@@ -8,6 +8,9 @@ module.exports = defineConfig({
     viewportWidth: 1024,
     viewportHeight: 576,
   },
+  env: {
+    PACKAGE_VERSION: version,
+  },
   includeShadowDom: true,
   retries: {
     runMode: 1,

packages/components/cypress/e2e/icon.cy.ts

@@ -197,8 +197,7 @@ describe('Icon', () => {
       cy.get('@inner').should(
         'have.css',
         'mask-image',
-        'url("https://unpkg.com/@swisspost/design-system-icons/public/post-icons/1000.svg")',
-      );
+        `url("https://unpkg.com/@swisspost/design-system-icons@${Cypress.env('PACKAGE_VERSION')}/public/post-icons/1000.svg")`,      );
     });
   });
 

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

@@ -8,7 +8,7 @@ type UrlDefinition = {
   definesSlug: boolean;
 };
 
-const CDN_URL = 'https://unpkg.com/@swisspost/design-system-icons/public/post-icons';
+const CDN_URL = `https://unpkg.com/@swisspost/design-system-icons@${version}/public/post-icons`;
 const ANIMATION_NAMES = [
   'cylon',
   'cylon-vertical',