chore: bump version to 3.0.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: kkomelin

package.json

@@ -1,6 +1,6 @@
 {
   "name": "isomorphic-dompurify",
-  "version": "3.0.0-rc.3",
+  "version": "3.0.0",
   "description": "Makes it possible to use DOMPurify on server and client in the same way.",
   "keywords": [
     "security",