Low Fi: Remove the patch version for submission (#7691)

lowfi/readme.txt

@@ -1,7 +1,7 @@
 === Low Fi ===
 Contributors: Automattic
 Requires at least: 6.0
-Tested up to: 6.4.3
+Tested up to: 6.4
 Requires PHP: 5.7
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html

lowfi/style.css

@@ -5,7 +5,7 @@ Author: Automattic
 Author URI: https://automattic.com/
 Description: Low Fi is a simple blog theme with Lo-fi aesthetics.
 Requires at least: 6.0
-Tested up to: 6.4.3
+Tested up to: 6.4
 Requires PHP: 5.7
 Version: 1.0.1
 License: GNU General Public License v2 or later