Site Health: Link to the correct plugin update screen in multisite installs.

Props Clorith, sebastienserre, jeremyfelt, desrosj.
Fixes #47189.

git-svn-id: https://develop.svn.wordpress.org/trunk@45308 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-site-health.php

@@ -340,7 +340,7 @@ class WP_Site_Health {
 
 			$result['actions'] .= sprintf(
 				'<p><a href="%s">%s</a></p>',
-				esc_url( admin_url( 'plugins.php?plugin_status=upgrade' ) ),
+				esc_url( network_admin_url( 'plugins.php?plugin_status=upgrade' ) ),
 				__( 'Update your plugins' )
 			);
 		} else {