Keep WebAuthn provider as zip download in wp-env config

The sjinks/wp-two-factor-provider-webauthn GitHub repo requires
composer install for its vendor/autoload.php. The zip download from
wordpress.org includes built dependencies and works out of the box.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: obenland

.wp-env.json

@@ -5,7 +5,7 @@
 		"WordPress/gutenberg",
 		"bbpress/bbPress",
 		"WordPress/two-factor",
-		"sjinks/wp-two-factor-provider-webauthn",
+		"https://downloads.wordpress.org/plugin/two-factor-provider-webauthn.latest-stable.zip",
 		"."
 	],
 	"mappings": {