Feeds: Remove whitespace from `<updated>` elements in Atom feeds.

Per Atom format's RFC, there must not be any whitespace in a Date construct or in any IRI.

Props josephwa.
Fixes #46922.
Built from https://develop.svn.wordpress.org/trunk@45208


git-svn-id: http://core.svn.wordpress.org/trunk@45017 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/feed-atom-comments.php

@@ -43,12 +43,11 @@ do_action( 'rss_tag_pre', 'atom-comments' );
 	</title>
 	<subtitle type="text"><?php bloginfo_rss( 'description' ); ?></subtitle>
 
-	<updated>
-	<?php
+	<updated><?php // phpcs:ignore Squiz.PHP.EmbeddedPhp.ContentBeforeOpen,Squiz.PHP.EmbeddedPhp.ContentAfterOpen
 		$date = get_last_build_date();
 		echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date, false ) : date( 'Y-m-d\TH:i:s\Z' );
-	?>
-	</updated>
+		// phpcs:ignore Squiz.PHP.EmbeddedPhp.ContentAfterEnd
+	?></updated>
 
 <?php if ( is_singular() ) { ?>
 	<link rel="alternate" type="<?php bloginfo_rss( 'html_type' ); ?>" href="<?php comments_link_feed(); ?>" />

wp-includes/feed-atom.php

@@ -30,12 +30,11 @@ do_action( 'rss_tag_pre', 'atom' );
 	<title type="text"><?php wp_title_rss(); ?></title>
 	<subtitle type="text"><?php bloginfo_rss( 'description' ); ?></subtitle>
 
-	<updated>
-	<?php
+	<updated><?php // phpcs:ignore Squiz.PHP.EmbeddedPhp.ContentBeforeOpen,Squiz.PHP.EmbeddedPhp.ContentAfterOpen
 		$date = get_last_build_date();
 		echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date, false ) : date( 'Y-m-d\TH:i:s\Z' );
-	?>
-	</updated>
+		// phpcs:ignore Squiz.PHP.EmbeddedPhp.ContentAfterEnd
+	?></updated>
 
 	<link rel="alternate" type="<?php bloginfo_rss( 'html_type' ); ?>" href="<?php bloginfo_rss( 'url' ); ?>" />
 	<id><?php bloginfo( 'atom_url' ); ?></id>

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.2-beta3-45207';
+$wp_version = '5.2-beta3-45208';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.