2024 Theme: Fix heading hierarchy in My Courses page

See #1060

wp-content/themes/pub/wporg-learn-2024/patterns/my-courses-content.php

@@ -42,7 +42,7 @@
 			<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|20","bottom":"var:preset|spacing|20","left":"20px","right":"20px"},"blockGap":"var:preset|spacing|10"},"layout":{"selfStretch":"fill","flexSize":null}},"layout":{"type":"flex","orientation":"vertical","justifyContent":"stretch"}} -->
 			<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--20);padding-right:20px;padding-bottom:var(--wp--preset--spacing--20);padding-left:20px">
 
-				<!-- wp:post-title {"level":3,"isLink":true,"style":{"typography":{"fontStyle":"normal","fontWeight":"600","lineHeight":1.6},"spacing":{"margin":{"bottom":"0"}},"elements":{"link":{"color":{"text":"var:preset|color|blueberry-1"}}}},"fontSize":"normal","fontFamily":"inter"} /-->
+				<!-- wp:post-title {"level":2,"isLink":true,"style":{"typography":{"fontStyle":"normal","fontWeight":"600","lineHeight":1.6},"spacing":{"margin":{"bottom":"0"}},"elements":{"link":{"color":{"text":"var:preset|color|blueberry-1"}}}},"fontSize":"normal","fontFamily":"inter"} /-->
 
 				<!-- wp:post-excerpt {"showMoreOnNewLine":false,"excerptLength":16,"style":{"typography":{"lineHeight":1.6},"layout":{"selfStretch":"fill","flexSize":null}}} /-->