Tests: display link instead of embed for Medium collections

Medium does not support Collection embeds anymore.

tests/php/modules/shortcodes/test-class.medium.php

@@ -58,17 +58,17 @@ public function test_shortcode_medium_faux_embed_story() {
 	}
 
 	/**
-	 * Verify that a post with a link to a Medium collection displays collection markup.
+	 * Verify that a post with a link to a Medium collection displays link (collection embeds are not supported anymore).
 	 *
-	 * @since 7.3.0
+	 * @since 7.4.0
 	 */
 	public function test_shortcode_medium_faux_embed_collection() {
 		$collection_url = 'https://medium.com/s/user-friendly';
 
 		$content = apply_filters( 'the_content', $collection_url );
 
 		$this->assertContains(
-			'<a class="m-collection" href="' . $collection_url,
+			'<a href="' . $collection_url . '" target="_blank" rel="noopener noreferrer">View this collection on Medium.com</a>',
 			$content
 		);
 	}