Harden htaccess for /wp-includes/ direct access

docker/htaccess

@@ -31,7 +31,7 @@ RewriteRule ^resource/[^/]+/download/(.*)$ wp-includes/ms-files.php?file=2010/08
 RewriteRule ^wp-admin/includes/ - [F,L]
 RewriteRule !^wp-includes/ - [S=2]
 RewriteCond $0 !^wp-includes/ms-files\.php$
-RewriteRule ^wp-includes/.+\.php$ - [F,L]
+RewriteRule ^wp-includes/.+\.php(/|$) - [F,L]
 RewriteRule ^wp-includes/theme-compat/ - [F,L]
 
 # BEGIN WPSuperCache