Coding Standards: Escape attachment URL in wp-admin/async-upload.php.

Follow-up to [58279].

Props shyamkariya, pitamdey, nareshbheda, ketanniruke, desrosj.
Fixes #62434.

git-svn-id: https://develop.svn.wordpress.org/trunk@59407 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/async-upload.php

@@ -74,7 +74,9 @@
 							}
 							?>
 							<span class="media-item-copy-container copy-to-clipboard-container edit-attachment">
-								<button type="button" class="button button-small copy-attachment-url" data-clipboard-text="<?php echo $file_url; ?>"><?php _e( 'Copy URL to clipboard' ); ?></button>
+								<button type="button" class="button button-small copy-attachment-url"
+									data-clipboard-text="<?php echo esc_url( $file_url ); ?>"
+								><?php _e( 'Copy URL to clipboard' ); ?></button>
 								<span class="success hidden" aria-hidden="true"><?php _e( 'Copied!' ); ?></span>
 							</span>
 						</div>